Limit connection growth by all streams plus incoming connections

[adam-fowler]

This should only create additional connections if we don't have the minimum number of connections or the number of available plus leased streams and the number of incoming connections is less than the size of the request queue.

Previously we did not take into account the number of incoming connections, which meant we would create additional connections. This does not solve the issue where incoming connections will server more than one request though.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.08%. Comparing base (98c87ef) to head (6ce9061).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #615      +/-   ##
==========================================
- Coverage   76.19%   76.08%   -0.12%     
==========================================
  Files         134      134              
  Lines       10145    10147       +2     
==========================================
- Hits         7730     7720      -10     
- Misses       2415     2427      +12     

Files with missing lines	Coverage Δ
...ources/ConnectionPoolModule/PoolStateMachine.swift	89.49% <100.00%> (+0.04%)	⬆️

... and 3 files with indirect coverage changes

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