Feature/jmespath filters

[GigiusB]

I have added a notification payload filter based on the excellent JMESpath expressions library: https://os4d.github.io/jmespath-filters/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.99%. Comparing base (4796611) to head (afbf21c).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #74      +/-   ##
===========================================
- Coverage    95.04%   94.99%   -0.06%     
===========================================
  Files          166      166              
  Lines         5688     5691       +3     
  Branches       500      496       -4     
===========================================
  Hits          5406     5406              
- Misses         197      198       +1     
- Partials        85       87       +2     

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