First try for QUIC (OpenSSL only and only checking the protocol)

[drwetter]

Describe your changes

This is an implementation for QUIC (RFC 9000, RFC 9114). It's purely OpenSSL based for now. As some distros support newer (>= 3.2) OpenSSL versions this works on some distros now and will work on more as time goes by.

It has been tested with MacOS and Linux. If there's an OpenSSL version in /usr/bin/ it will automagically use that version. A new short sub function named sub_quic() was introduced for handling this as run_protocols() is already "full". Cipher tests will follow later.

It appears below TLS 1.3. A check against HTTPS RR before #2484 is planned but not implemented yet. PR #2484 has to be worked on and merged before.

New variables were introduces (HAS_QUIC/ +HAS2_QUIC). Also there's QUIC_WAIT as we run the connect in the background and we need a wait time.

HAS_UDS2 was renamed to HAS2_UDS as HAS2 should signal this is for OPENSSL2 and UDS2 doesn't make sense.

To clarify:

• check for a proxy and then don't do the check?
• short unit test (t/31_isJSON_valid.t checks cloudflare but ...) --> there's no OpenSSL >= 3.2
• CHANGELOG
• documentation

This fixes #2750

What is your pull request about?

• Bug fix
• Improvement
• New feature (adds functionality)
• Breaking change (bug fix, feature or improvement that would cause existing functionality to not work as expected)
• Typo fix
• Documentation update
• Update of other files

If it's a code change please check the boxes which are applicable

• For the main program: My edits contain no tabs, indentation is five spaces and any line endings do not contain any blank chars
• I've read CONTRIBUTING.md and Coding_Convention.md
• I have tested this fix or improvement against >=2 hosts and I couldn't spot a problem
• I have tested this new feature against >=2 hosts which show this feature and >=2 host which does not (in order to avoid side effects) . I couldn't spot a problem
• For the new feature I have made corresponding changes to the documentation and / or to help()
• If it's a bigger change: I added myself to CREDITS.md (alphabetical order) and the change to CHANGELOG.md