Add a tls handshake timeout option. Make reads interruptible in pcntl.

[ChadSikorra]

Two options here related to issues in the LDAP library:

1. There's currently no timeout related to TLS handshakes. If a client starts one but never completes it we hang on the read timeout. I'm defaulting this to 5s and letting it be configurable. Surprisingly other implementations don't seem to enforce this. But it's important for us to have some kind of timeout since one of the main runners on the LDAP side is a forking based process.
2. We need a way for reads to be interruptible in PCNTL so that the server process can interrupt it and send a proper notice of disconnect. For a client that is otherwise awaiting a read this doesn't really happen. So this updates it to use stream_select which allows us to actually interrupt and send a proper notice of disconnect instead of force killing clients when the server shuts down or restarts.

[codecov]

Codecov Report

❌ Patch coverage is 52.72727% with 26 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.31%. Comparing base (02ed927) to head (e3f9a0e).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/FreeDSx/Socket/Socket.php	58.00%	21 Missing ⚠️
src/FreeDSx/Socket/HasSocketOptions.php	0.00%	5 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #22      +/-   ##
============================================
- Coverage     78.70%   76.31%   -2.39%     
- Complexity      206      224      +18     
============================================
  Files            14       14              
  Lines           648      701      +53     
============================================
+ Hits            510      535      +25     
- Misses          138      166      +28     

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