Support LengthPrefixedConnectionIds in v99

This CL adds support for the invariants change from draft-22. It introduces a new parsing method QuicFramer::ParsePublicHeader which can parse both old and new formats, and uses it for v99 and also for all versions when gfe2_reloadable_flag_quic_use_parse_public_header is true.

gfe-relnote: change v99 encoding, protected by disabled v99 flag and by gfe2_reloadable_flag_quic_use_parse_public_header.
PiperOrigin-RevId: 260871822
Change-Id: I680d12141b2731401a818ed335af03e7c5365219
diff --git a/quic/core/quic_dispatcher.h b/quic/core/quic_dispatcher.h
index cfaafa0..091e727 100644
--- a/quic/core/quic_dispatcher.h
+++ b/quic/core/quic_dispatcher.h
@@ -254,6 +254,7 @@
       QuicConnectionId server_connection_id,
       PacketHeaderFormat format,
       bool version_flag,
+      bool use_length_prefix,
       ParsedQuicVersion version,
       QuicErrorCode error_code,
       const std::string& error_details,