Make sure we return 422 on non-existing measure POST requests (Fixes #512)

[allentiak]

module: operation-evaluate-measure

• apply parinfer-required formatting
• add failing POST regression test for Fix Status Code of Type-Level $evaluate-measure Operation #512
• major refactoring: tests: separate handler instance tests from handler
  type tests (WIP)
• add missing test for "with missing measure parameter" POST requests
• other minor refactorings

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.96%. Comparing base (7e5533c) to head (a0e55c4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2008   +/-   ##
=======================================
  Coverage   94.95%   94.96%           
=======================================
  Files         320      320           
  Lines       19692    19699    +7     
  Branches      462      462           
=======================================
+ Hits        18699    18707    +8     
+ Misses        531      530    -1     
  Partials      462      462           

see 3 files with indirect coverage changes