Add declarative config support for ExemplarFilter

[jack-berg]

Resolves #7667

[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.18%. Comparing base (a01288b) to head (839c1bc).

Files with missing lines	Patch %	Lines
...on/incubator/fileconfig/ExemplarFilterFactory.java	71.42%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #7769      +/-   ##
============================================
+ Coverage     90.16%   90.18%   +0.02%     
- Complexity     7189     7200      +11     
============================================
  Files           814      815       +1     
  Lines         21730    21744      +14     
  Branches       2129     2130       +1     
============================================
+ Hits          19592    19609      +17     
+ Misses         1469     1468       -1     
+ Partials        669      667       -2     

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