Improve search param extraction flexibility

[jmarchionatto]

What was done:

1. added myExtractResourceLevelParams property to allow extraction of Resource-level search param values
2. extracted some code to be reused to an util class
3. Allowed test to specify a Patient provider to RestServerR4Helper

[github-actions]

Formatting check succeeded!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.49%. Comparing base (497b9f2) to head (01fda4c).
Report is 112 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6030      +/-   ##
============================================
+ Coverage     83.39%   83.49%   +0.10%     
- Complexity    26927    27347     +420     
============================================
  Files          1681     1703      +22     
  Lines        103965   105906    +1941     
  Branches      13189    13365     +176     
============================================
+ Hits          86702    88430    +1728     
- Misses        11613    11760     +147     
- Partials       5650     5716      +66     

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[dotasek]

Test for the myExtractResourceLevelParams looks good. Is this change attached to a feature, or something else that needs to be put in the changelog, or are these just quality of life improvements.