connections: introduce http/3 happy eyeballs

New cfilter HTTP-CONNECT for h3/h2/http1.1 eyeballing.
- filter is installed when `--http3` in the tool is used (or
  the equivalent CURLOPT_ done in the library)
- starts a QUIC/HTTP/3 connect right away. Should that not
  succeed after 100ms (subject to change), a parallel attempt
  is started for HTTP/2 and HTTP/1.1 via TCP
- both attempts are subject to IPv6/IPv4 eyeballing, same
  as happens for other connections
- tie timeout to the ip-version HAPPY_EYEBALLS_TIMEOUT
- use a `soft` timeout at half the value. When the soft timeout
  expires, the HTTPS-CONNECT filter checks if the QUIC filter
  has received any data from the server. If not, it will start
  the HTTP/2 attempt.

HTTP/3(ngtcp2) improvements.
- setting call_data in all cfilter calls similar to http/2 and vtls filters
  for use in callback where no stream data is available.
- returning CURLE_PARTIAL_FILE for prematurely terminated transfers
- enabling pytest test_05 for h3
- shifting functionality to "connect" UDP sockets from ngtcp2
  implementation into the udp socket cfilter. Because unconnected
  UDP sockets are weird. For example they error when adding to a
  pollset.

HTTP/3(quiche) improvements.
- fixed upload bug in quiche implementation, now passes 251 and pytest
- error codes on stream RESET
- improved debug logs
- handling of DRAIN during connect
- limiting pending event queue

HTTP/2 cfilter improvements.
- use LOG_CF macros for dynamic logging in debug build
- fix CURLcode on RST streams to be CURLE_PARTIAL_FILE
- enable pytest test_05 for h2
- fix upload pytests and improve parallel transfer performance.

GOAWAY handling for ngtcp2/quiche
- during connect, when the remote server refuses to accept new connections
  and closes immediately (so the local conn goes into DRAIN phase), the
  connection is torn down and a another attempt is made after a short grace
  period.
  This is the behaviour observed with nghttpx when we tell it to  shut
  down gracefully. Tested in pytest test_03_02.

TLS improvements
- ALPN selection for SSL/SSL-PROXY filters in one vtls set of functions, replaces
  copy of logic in all tls backends.
- standardized the infof logging of offered ALPNs
- ALPN negotiated: have common function for all backends that sets alpn proprty
  and connection related things based on the negotiated protocol (or lack thereof).

- new tests/tests-httpd/scorecard.py for testing h3/h2 protocol implementation.
  Invoke:
    python3 tests/tests-httpd/scorecard.py --help
  for usage.

Improvements on gathering connect statistics and socket access.
- new CF_CTRL_CONN_REPORT_STATS cfilter control for having cfilters
  report connection statistics. This is triggered when the connection
  has completely connected.
- new void Curl_pgrsTimeWas(..) method to report a timer update with
  a timestamp of when it happend. This allows for updating timers
  "later", e.g. a connect statistic after full connectivity has been
  reached.
- in case of HTTP eyeballing, the previous changes will update
  statistics only from the filter chain that "won" the eyeballing.
- new cfilter query CF_QUERY_SOCKET for retrieving the socket used
  by a filter chain.
  Added methods Curl_conn_cf_get_socket() and Curl_conn_get_socket()
  for convenient use of this query.
- Change VTLS backend to query their sub-filters for the socket when
  checks during the handshake are made.

HTTP/3 documentation on how https eyeballing works.

TLS improvements
- ALPN selection for SSL/SSL-PROXY filters in one vtls set of functions, replaces
  copy of logic in all tls backends.
- standardized the infof logging of offered ALPNs
- ALPN negotiated: have common function for all backends that sets alpn proprty
  and connection related things based on the negotiated protocol (or lack thereof).

Scorecard with Caddy.
- configure can be run with `--with-test-caddy=path` to specify which caddy to use for testing
- tests/tests-httpd/scorecard.py now measures download speeds with caddy

pytest improvements
- adding Makfile to clean gen dir
- adding nghttpx rundir creation on start
- checking httpd version 2.4.55 for test_05 cases where it is needed. Skipping with message if too old.
- catch exception when checking for caddy existance on system.

Closes #10349

lib/progress.c

@@ -166,14 +166,11 @@ void Curl_pgrsResetTransferSizes(struct Curl_easy *data)
 
 /*
  *
- * Curl_pgrsTime(). Store the current time at the given label. This fetches a
- * fresh "now" and returns it.
- *
- * @unittest: 1399
+ * Curl_pgrsTimeWas(). Store the timestamp time at the given label.
  */
-struct curltime Curl_pgrsTime(struct Curl_easy *data, timerid timer)
+void Curl_pgrsTimeWas(struct Curl_easy *data, timerid timer,
+                      struct curltime timestamp)
 {
-  struct curltime now = Curl_now();
   timediff_t *delta = NULL;
 
   switch(timer) {
@@ -183,15 +180,15 @@ struct curltime Curl_pgrsTime(struct Curl_easy *data, timerid timer)
     break;
   case TIMER_STARTOP:
     /* This is set at the start of a transfer */
-    data->progress.t_startop = now;
+    data->progress.t_startop = timestamp;
     break;
   case TIMER_STARTSINGLE:
     /* This is set at the start of each single fetch */
-    data->progress.t_startsingle = now;
+    data->progress.t_startsingle = timestamp;
     data->progress.is_t_startransfer_set = false;
     break;
   case TIMER_STARTACCEPT:
-    data->progress.t_acceptdata = now;
+    data->progress.t_acceptdata = timestamp;
     break;
   case TIMER_NAMELOOKUP:
     delta = &data->progress.t_nslookup;
@@ -214,7 +211,7 @@ struct curltime Curl_pgrsTime(struct Curl_easy *data, timerid timer)
      * changing the t_starttransfer time.
      */
     if(data->progress.is_t_startransfer_set) {
-      return now;
+      return;
     }
     else {
       data->progress.is_t_startransfer_set = true;
@@ -224,15 +221,30 @@ struct curltime Curl_pgrsTime(struct Curl_easy *data, timerid timer)
     /* this is the normal end-of-transfer thing */
     break;
   case TIMER_REDIRECT:
-    data->progress.t_redirect = Curl_timediff_us(now, data->progress.start);
+    data->progress.t_redirect = Curl_timediff_us(timestamp,
+                                                 data->progress.start);
     break;
   }
   if(delta) {
-    timediff_t us = Curl_timediff_us(now, data->progress.t_startsingle);
+    timediff_t us = Curl_timediff_us(timestamp, data->progress.t_startsingle);
     if(us < 1)
       us = 1; /* make sure at least one microsecond passed */
     *delta += us;
   }
+}
+
+/*
+ *
+ * Curl_pgrsTime(). Store the current time at the given label. This fetches a
+ * fresh "now" and returns it.
+ *
+ * @unittest: 1399
+ */
+struct curltime Curl_pgrsTime(struct Curl_easy *data, timerid timer)
+{
+  struct curltime now = Curl_now();
+
+  Curl_pgrsTimeWas(data, timer, now);
   return now;
 }