Create the SSL object for QUIC-TLS

Create the SSL object for QUIC-TLS

The "user" SSL object which represents the QUIC connection should have an
"inner" SSL object to represent the TLS connection.

Reviewed-by: Hugo Landau <hlandau@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/19748)