Add new test setup .asyncTest

[adam-fowler]

Makes use of new NIOAsyncTestingChannel.
Fixed issues with NIOAsyncTestingChannel by temporarily adding a poll for result with timeout

[codecov]

Codecov Report

Base: 78.00% // Head: 76.24% // Decreases project coverage by -1.75% ⚠️

Coverage data is based on head (e831e9a) compared to base (564f63f).
Patch coverage: 11.62% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #144      +/-   ##
==========================================
- Coverage   78.00%   76.24%   -1.76%     
==========================================
  Files          72       74       +2     
  Lines        3105     3187      +82     
==========================================
+ Hits         2422     2430       +8     
- Misses        683      757      +74     

Impacted Files	Coverage Δ
Sources/Hummingbird/Configuration.swift	66.66% <ø> (ø)
Sources/HummingbirdXCT/HBXCT.swift	0.00% <0.00%> (ø)
Sources/HummingbirdXCT/HBXCTAsyncTesting.swift	0.00% <0.00%> (ø)
Sources/HummingbirdXCT/Application+XCT.swift	66.66% <16.66%> (-33.34%)	⬇️
Sources/HummingbirdXCT/HBXCTLive.swift	83.78% <100.00%> (+3.13%)	⬆️
Sources/HummingbirdJobs/MemoryJobQueue.swift	100.00% <0.00%> (+6.45%)	⬆️

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