stream info formatter: Add UP/DOWNSTREAM_TLS_GROUP command operators

[meierfra-ergon]

Commit Message:
stream info formatter: Add UP/DOWNSTREAM_TLS_GROUP command operators

Additional Description:
to discern if a TLS connection used a post quantum safe key exchange, the TLS group may be logged via the command operators UPSTREAM_TLS_GROUP and DOWNSTREAM_TLS_GROUP.

Risk Level: 0

Testing: TODO

Docs Changes: TODO

Release Notes: TODO

Platform Specific Features: NO

[meierfra-ergon]

This is only a functional change introducing new command operators to access the TLS group used to establish a TLS connection.
We would like to log this information to discern if a connection was/is safe against quantum crypto attacks.

I have not written up tests and doc yet because I first like to assert if you are willing to accept this kind of change. If so please tell me, then I will provide the missing tests/doc.