Add PointInTimeCriterion.forward_fill property

[scymtym]

Controls whether PointInTimeCriterion.process_data should forward fill temporal intervals.

[codecov]

Codecov Report

Attention: Patch coverage is 73.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 87.57%. Comparing base (b3cdb36) to head (b0440f0).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
execution_engine/omop/criterion/point_in_time.py	73.33%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #237      +/-   ##
==========================================
- Coverage   87.61%   87.57%   -0.05%     
==========================================
  Files          92       92              
  Lines        5852     5865      +13     
==========================================
+ Hits         5127     5136       +9     
- Misses        725      729       +4     

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