engine-fhir tests improvements

[antvaset]

A few small changes:

• Fixed Log operator evaluation: Log returns null when base is 1. The spec says If the result of the operation cannot be represented, the result is null. (source). Added new test case for log_1(2) in addition to log_1(1).
• Fixed the ranges for the Decimal type: As per the spec, decimal values are in range (-10^28^+1)/10^8^..(10^28^-1)/10^8^, i.e. -99999999999999999999.99999999..99999999999999999999.99999999 (20 nines before the decimal point and 8 nines after the decimal point).
• Added support for Long types in truncated division: 10L div 3L now returns 3L as expected.
• Fixed IndexOf operator evaluation: IndexOf returns null if the element argument is null as per the spec.
• Fixed the Includes_NegInfBegIncludesDateIvl test in the CqlTestSuite library which was failing in NZ timezone: When the lower boundary of DateTime-typed Interval is null, it is set to minimum DateTime which strictly speaking returns DateTime(1, 1, 1, 0, 0, 0, 0, 0) and not DateTime(1, 1, 1, 0, 0, 0, 0).

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 4 lines in your changes missing coverage. Please review.

Project coverage is 62.26%. Comparing base (e00c396) to head (74bf237).
Report is 1 commits behind head on master.

Files	Patch %	Lines
...engine/elm/executing/TruncatedDivideEvaluator.java	0.00%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1369      +/-   ##
============================================
- Coverage     62.26%   62.26%   -0.01%     
- Complexity     6951     6953       +2     
============================================
  Files           492      492              
  Lines         27727    27731       +4     
  Branches       5506     5508       +2     
============================================
+ Hits          17265    17266       +1     
- Misses         8198     8200       +2     
- Partials       2264     2265       +1     

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