cf-socket: keep sockaddr local in the socket filters

- copy `struct Curl_addrinfo` on filter setup into context
- remove `struct Curl_addrinfoi *` with `struct Curl_sockaddr_ex *` in
  connectdata that is set and NULLed by the socket filter
- this means we have no reference to the resolver info in connectdata or
  its filters
- trigger the CF_CTRL_CONN_INFO_UPDATE event when the complete filter
  chain reaches connected status
- update easy handle connection information on CF_CTRL_DATA_SETUP event.

Closes #10213

lib/ftp.c

@@ -1010,9 +1010,9 @@ static CURLcode ftp_state_use_port(struct Curl_easy *data,
 
     if(*addr != '\0') {
       /* attempt to get the address of the given interface name */
-      switch(Curl_if2ip(conn->ip_addr->ai_family,
+      switch(Curl_if2ip(conn->remote_addr->family,
 #ifdef ENABLE_IPV6
-                        Curl_ipv6_scope(conn->ip_addr->ai_addr),
+                        Curl_ipv6_scope(&conn->remote_addr->sa_addr),
                         conn->scope_id,
 #endif
                         addr, hbuf, sizeof(hbuf))) {