Set phpstan to max and fix analysis issues.

[ChadSikorra]

Bumping PHPStan to max and fixing analysis issues. Doing this across all FreeDSx deps prior to 1.0 release.

[codecov]

Codecov Report

❌ Patch coverage is 59.25926% with 22 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.63%. Comparing base (7f4cb90) to head (0350eec).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/FreeDSx/Socket/Socket.php	68.96%	9 Missing ⚠️
src/FreeDSx/Socket/Queue/Asn1MessageQueue.php	30.00%	7 Missing ⚠️
src/FreeDSx/Socket/SocketServer.php	60.00%	6 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #11      +/-   ##
============================================
- Coverage     83.29%   81.63%   -1.66%     
- Complexity      142      144       +2     
============================================
  Files            10       10              
  Lines           425      452      +27     
============================================
+ Hits            354      369      +15     
- Misses           71       83      +12     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.