fhirpath parsing now includes comments and whitespace into the Expression object model. #2779
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Description
This extends on the work in the fhirpath parsing changes to be able to capture the whitespace including comments to permit exact round trips with the Expression tree.
Related issues
#2517
Testing
There are many unit tests for this, and also tested with my fhirpath validator project locally to verify that it sucessfully roundtripped all the expressions in the R4B/R5 invariants, searchparameters and about 10 large implementation guides.
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