[Feat] TLS support

[ndrean]

@g41797

Solves #13

Heavily inspired by: https://github.com/karlseguin/websocket.zig/blob/master/src/client/client.zig and https://github.com/karlseguin/smtp_client.zig/blob/master/src/stream.zig

So the TLS is heavily inspired by Karl Seguin work:

• use arena for a static pre-shaped buffer for the 4 reads/Writes, wrapped in a Box{} (Tls.zig) with the init() using the new std.Io.Writer|Reader. TBH, how this works is not clear with this .stream.reader|writer.interface(buffer).
• Client.zig is where the Client.upgradeTLS() and Client.connect() are declared, and used in _Conn._connect()
• Added TLS test check to CI. The .pem files are built in-situ with openSSL so that it is independent from the ones I created for local testing.

The local act -W .github/workflows/ci.yml --container-architecture linux/arm64 -j test passes.
The push to my forked also passes.

Solves #16 : Added docs step to publish on push. Also works on my fork (you must enable github pages in settings/pages/)

A bit of additional housekeeping (removed forgotten dead struct and renaming to be consistent) on the structs in the protocol.zig.

[g41797]

@ndrean
check your collaborator rights - merge pr
and thank you for hard work

[ndrean]

@g41797
I thought you were going to run your reviewer tool. CodeRabbit AI?

[g41797]

I'll run Claude Code later in order to add several new commands using generic request function
Just becuase it's completely mechanic work and used already "manually" developed code. I did not use AI for code generation, rather fixing docs, css, htmls, js - mostly for docs site