Allow packetizer to accept an arg to set protocol version

Allow packetizer to accept an arg to set protocol version

In preparation for doing version negotiation, expose the ability to have
the packetiser for QUIC set a configured protocol version.  We only set
it to QUIC_VERSION_1 for now, but it allows for us to set different
protocols in the future.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Saša Nedvědický <sashan@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/25968)