verify FilterContext equals

[sullis]

use the equalsverifier library to validate our 'equals' method

https://jqno.nl/equalsverifier/

https://jqno.nl/equalsverifier/errormessages/recursive-datastructure/

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.67%. Comparing base (59551e4) to head (6bb1eb8).
Report is 79 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #12593      +/-   ##
============================================
- Coverage     61.75%   61.67%   -0.08%     
- Complexity      207      211       +4     
============================================
  Files          2436     2451      +15     
  Lines        133233   133730     +497     
  Branches      20636    20704      +68     
============================================
+ Hits          82274    82478     +204     
- Misses        44911    45145     +234     
- Partials       6048     6107      +59     

Flag	Coverage Δ
custom-integration1	<0.01% <ø> (-0.01%)	⬇️
integration	<0.01% <ø> (-0.01%)	⬇️
integration1	<0.01% <ø> (-0.01%)	⬇️
integration2	?
java-11	61.67% <ø> (-0.04%)	⬇️
java-21	<0.01% <ø> (-61.63%)	⬇️
skip-bytebuffers-false	61.67% <ø> (-0.08%)	⬇️
skip-bytebuffers-true	?
temurin	61.67% <ø> (-0.08%)	⬇️
unittests	61.67% <ø> (-0.08%)	⬇️
unittests1	46.89% <ø> (+<0.01%)	⬆️
unittests2	27.63% <ø> (-0.10%)	⬇️

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