Add the option to configure TCP buffer sizes

[amoerie]

I'm currently working on consolidating our custom fo-dicom fork changes. This is a small part of that. :-)

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 ReceiveBufferSize and SendBufferSize options in (two) places where we create a TcpClient

I don't have a clue how this can be unit tested. :-)

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.05 🎉

Comparison is base (58efbad) 79.99% compared to head (abb9728) 80.04%.

Additional details and impacted files

@@               Coverage Diff               @@
##           development    #1564      +/-   ##
===============================================
+ Coverage        79.99%   80.04%   +0.05%     
===============================================
  Files              266      266              
  Lines            24848    24857       +9     
===============================================
+ Hits             19877    19898      +21     
+ Misses            4971     4959      -12     

Impacted Files	Coverage Δ
FO-DICOM.Core/Network/Client/DicomClient.cs	96.96% <ø> (ø)
FO-DICOM.Core/Network/DesktopNetworkListener.cs	87.50% <ø> (ø)
FO-DICOM.Core/Network/DicomServer.cs	92.77% <ø> (ø)
FO-DICOM.Core/Network/DesktopNetworkStream.cs	95.65% <100.00%> (+0.78%)	⬆️
FO-DICOM.Core/Network/DicomServiceOptions.cs	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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