[do not review] feat: TlsSocket AsyncWriteSome and AsyncReadSome

[kostasrim]

Implement async io for TlsSocket.

• add AsyncReadSome
• add AsyncWriteSome
• add tests
• add tls certificates

Resolves #361 when ready.

There are a few things that need to be fixed/implemented:

1. "Yield" when there a pending read or write (to avoid deadlock) see HandleOp comments.
2. Clean up the state such that progress callbacks can call async io again.
3. Clean up the main loop of AsyncWrite and control flow.
4. Improve testing(coverage): a) force tls protocol renegotiation b) send a lot data back and forth.

[kostasrim]

Do not review, it's not ready

[kostasrim]

epoll AsyncRead is synchronous

[kostasrim]

I think 50 years will be enough for this to last 🤓 (that's the --days I used to generate it)

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 84.56140% with 44 lines in your changes missing coverage. Please review.

Project coverage is 77.67%. Comparing base (d30de86) to head (701425a).
Report is 148 commits behind head on master.

Files with missing lines	Patch %	Lines
util/tls/tls_socket.cc	71.42%	42 Missing ⚠️
util/tls/tls_socket_test.cc	98.50%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #376      +/-   ##
==========================================
+ Coverage   77.60%   77.67%   +0.06%     
==========================================
  Files         103      112       +9     
  Lines        7824     9557    +1733     
==========================================
+ Hits         6072     7423    +1351     
- Misses       1752     2134     +382     

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