Add new undocumented option ReportUnreadMessageData to emit a diagnostic warning if data is left unread

[jpdillingham]

I discovered through #968 that a message had the potential to contain additional data, but the code wasn't reading it. I've run into this before and it has been in the back of my mind that I might be discarding data from incoming messages unknowingly.

This PR adds an undocumented ReportUnreadMessageData public static property to SoulseekClient that when set to true will cause every message to check whether there is unread data after parsing and if so, emit a diagnostic warning. This setting can be turned on or off at any time after the SoulseekClient class has been instantiated.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.20%. Comparing base (d22818f) to head (cddbf13).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #970      +/-   ##
==========================================
+ Coverage   99.19%   99.20%   +0.01%     
==========================================
  Files         189      189              
  Lines        6707     6829     +122     
  Branches     1026     1085      +59     
==========================================
+ Hits         6653     6775     +122     
  Misses         41       41              
  Partials       13       13              

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud