Release 2.28.0

- [API] lsquic_ssl_sess_to_resume_info() is the new way to get
  session info.
- [API] Add user pointer to ea_generate_scid callback.
- [API] Add lsquic_dcid_from_packet() -- a fast function to parse
  out DCID.
- [API] Add es_max_batch_size to control outgoing packet batch size.
- [BUGFIX] Disallow sending of header while promise is being written.
- [BUGFIX] Flush stream when buffered bytes exhaust stream cap.
- [BUGFIX] Deactivate HQ frame if writing push promise fails.
- Perform sanity check on peer transport parameters and fail the
  handshake if some flow control limits are too low.  This can be
  turned off, see es_check_tp_sanity.
- http_server: fix how requests are read in "hq" mode.

tests/test_send_headers.c

@@ -531,7 +531,8 @@ test_pp_wantwrite_restoration (const int want_write)
     lsquic_stream_window_update(stream, 100);
     lsquic_stream_dispatch_write_events(stream);
     assert((stream->stream_flags & (STREAM_NOPUSH|STREAM_PUSHING))
-                                        == (STREAM_NOPUSH|STREAM_PUSHING));
+        /* After push promise was all written, STREAM_PUSHING is no longer set */
+                                        == STREAM_NOPUSH);
     assert(SLIST_FIRST(&stream->sm_promises)->pp_write_state == PPWS_DONE); /* Done! */
     assert(want_write == s_onwrite_called); /* Restored: and on_write called */