ratelimit: redesign

Description of how this works in `docs/internal/RATELIMITS.ms`.

Notable implementation changes:
- KEEP_SEND_PAUSE/KEEP_SEND_HOLD and KEEP_RECV_PAUSE/KEEP_RECV_HOLD
  no longer exist. Pausing is down via blocked the new rlimits.
- KEEP_SEND_TIMED no longer exists. Pausing "100-continue" transfers
  is done in the new `Curl_http_perform_pollset()` method.
- HTTP/2 rate limiting implemented via window updates. When
  transfer initiaiting connection has a ratelimit, adjust the
  initial window size
- HTTP/3 ngtcp2 rate limitin implemnented via ack updates
- HTTP/3 quiche does not seem to support this via its API
- the default progress-meter has been improved for accuracy
  in "current speed" results.

pytest speed tests have been improved.

Closes #19384

lib/ldap.c

@@ -509,7 +509,7 @@ static CURLcode ldap_do(struct Curl_easy *data, bool *done)
     goto quit;
   }
 
-  Curl_pgrsSetDownloadCounter(data, 0);
+  Curl_pgrsReset(data);
   rc = ldap_search_s(server, ludp->lud_dn,
                      (curl_ldap_num_t)ludp->lud_scope,
                      ludp->lud_filter, ludp->lud_attrs, 0, &ldapmsg);