Minor improvements and extra logging for DesktopNetworkListener

[amoerie]

If a generic exception occurs while trying to listen for inbound connections, at the very least we should log that.
Secondly, exceptions that occur there would be wrapped inside an AggregateException because we used .Result.
Lastly, this PR also adds a little bit of debug logging.

Checklist

• The pull request branch is in sync with latest commit on the fo-dicom/development branch
• I have updated API documentation
• I have included unit tests
• I have updated the change log
• I am listed in the CONTRIBUTORS file

Changes proposed in this pull request:

• Add logging to DesktopNetworkListener
• Use referential equality to check for the Task.WhenAny winner
• Use await instead of .Result so exceptions are not wrapped in an unnecessary AggregateException

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (1d9c03c) 79.80% compared to head (7009a2b) 79.80%.

Additional details and impacted files

@@             Coverage Diff              @@
##           development    #1561   +/-   ##
============================================
  Coverage        79.80%   79.80%           
============================================
  Files              263      263           
  Lines            24659    24660    +1     
============================================
+ Hits             19678    19679    +1     
  Misses            4981     4981           

Impacted Files	Coverage Δ
FO-DICOM.Core/Network/DicomServer.cs	92.77% <ø> (ø)
FO-DICOM.Core/Network/DesktopNetworkListener.cs	46.66% <100.00%> (+3.80%)	⬆️

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