Cancellation works when talking to a silent server

[fabianfett]

If a server does not respond to any postgres messages, we should timeout connection creation eventually. If the connection isn't needed before the timeout hits, we should cancel connection creation. This PR adds both behaviors.

[codecov]

Codecov Report

❌ Patch coverage is 79.38144% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.93%. Comparing base (f2188e0) to head (e910ac8).

Files with missing lines	Patch %	Lines
.../PostgresNIO/Connection/ConnectCancelHandler.swift	76.92%	9 Missing ⚠️
Sources/PostgresNIO/New/PSQLEventsHandler.swift	65.00%	7 Missing ⚠️
...es/PostgresNIO/Connection/PostgresConnection.swift	89.18%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #647      +/-   ##
==========================================
+ Coverage   76.76%   76.93%   +0.17%     
==========================================
  Files         135      136       +1     
  Lines       10414    10500      +86     
==========================================
+ Hits         7994     8078      +84     
- Misses       2420     2422       +2     

Files with missing lines	Coverage Δ
Sources/PostgresNIO/Pool/ConnectionFactory.swift	84.40% <100.00%> (+0.91%)	⬆️
...es/PostgresNIO/Connection/PostgresConnection.swift	84.35% <89.18%> (+1.34%)	⬆️
Sources/PostgresNIO/New/PSQLEventsHandler.swift	78.87% <65.00%> (-6.04%)	⬇️
.../PostgresNIO/Connection/ConnectCancelHandler.swift	76.92% <76.92%> (ø)

... and 10 files with indirect coverage changes

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