Update behavior of included operator

[JPercival]

• Resolves Incorrect result for list in and contains with nulls #1344
• The CQL spec states that nulls receive special handling for Lists and also states that included in is equivalent to includes for singleton values, so there's a bit of inconsistency there that needs to be addressed:
  • https://cql.hl7.org/09-b-cqlreference.html#included-in

    For the point overload, this operator is a synonym for the in operator, and will return null if the first argument is null, and false if the second argument is null.

  • https://cql.hl7.org/09-b-cqlreference.html#in-1

    If the first argument is null, the result is true if the list contains any null elements, and false otherwise. If the second argument is null, the result is false.

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.14%. Comparing base (75801fe) to head (3118892).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1353      +/-   ##
============================================
- Coverage     63.17%   63.14%   -0.03%     
+ Complexity     6132     6127       -5     
============================================
  Files           468      468              
  Lines         25360    25358       -2     
  Branches       4720     4719       -1     
============================================
- Hits          16020    16013       -7     
- Misses         7183     7184       +1     
- Partials       2157     2161       +4     

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