Refactor MethodUtil by breaking it up into several methods.

[lukedegruchy]

• Intended to have zero functional impact
• Refactor MethodUtil by breaking it up into several methods.
• Add a new unit test.
• Add a new unit test utils class with several different kinds of methods, both with and without @operation.
• Intended to set the table for implementing embedded operation params functionality needed by clinical reasoning to ensure changes in hapi-fhir and cdr (non cdr-cr) are not required for API changes
• For context: This is a draft branch with the embedded parameters feature: Add new annotations to support embedded parameters, ranged values, and source type for conversion from @OperationParams. #6659

[github-actions]

Formatting check succeeded!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.52%. Comparing base (46d5809) to head (e44aaf0).
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6653      +/-   ##
============================================
+ Coverage     83.50%   83.52%   +0.02%     
- Complexity    28566    28587      +21     
============================================
  Files          1797     1797              
  Lines        111166   111219      +53     
  Branches      13965    13960       -5     
============================================
+ Hits          92828    92899      +71     
+ Misses        12351    12335      -16     
+ Partials       5987     5985       -2     

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