Fix Fhir JsonParser issue

[eldcn]

Fix Fhir JsonParser issue

:recycle: Current situation & Problem

A workaround to fix Class to large exception due to JsonParser of Fhir

• Introduce a new measurements module that handles internally mapping to fhir models and saving to firebase
• Hide org.hl7.fhir.r4 models from public api and exclude from app

:gear: Release Notes

Add a bullet point list summary of the feature and possible migration guides if this is a breaking change so this section can be added to the release notes. Include code snippets that provide examples of the feature implemented or links to the documentation if it appends or changes the public interface.

:books: Documentation

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:white_check_mark: Testing

Please ensure that the PR meets the testing requirements set by CodeCov and that new functionality is appropriately tested. This section describes important information about the tests and why some elements might not be testable.

:pencil: Code of Conduct & Contributing Guidelines

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 44.68%. Comparing base (b26b86b) to head (5bc97aa).

Additional details and impacted files

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