Add test to confirm new token functionality

Add test to confirm new token functionality

Basically just create two clients and two servers, ensuring that both
clients use the same ctx (to share the token cache).

Connect the first client and server so that the cache gets populated
with a new token, tracing the ssl connection

Connect the second client and server, again tracing the connection with
the same bio

Then sift through the trace, looking for the new token frame in the
first connection, matching it with the token used in the second
connection.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Saša Nedvědický <sashan@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/26517)