Create New Parsers Framework

[cbrinson-rise8]

Description

Abstract the parsing of FHIR out into its own module, as the linking algorithm should be input format agnostic. This approach will let us expand our supported formats for ELR and eCR ahead.

Related Issues

closes #80

Additional Notes

• creates recordlinker.parsers.fhir
• add new link/fhir endpoint that accepts fhir bundles but response similar to the /link endpoint
• add tests for new endpoint and new test file for fhir parser

<--------------------- REMOVE THE LINES BELOW BEFORE MERGING --------------------->

Checklist

Please review and complete the following checklist before submitting your pull request:

• I have ensured that the pull request is of a manageable size, allowing it to be reviewed within a single session.
• I have reviewed my changes to ensure they are clear, concise, and well-documented.
• I have updated the documentation, if applicable.
• I have added or updated test cases to cover my changes, if applicable.
• I have minimized the number of reviewers to include only those essential for the review.

Checklist for Reviewers

Please review and complete the following checklist during the review process:

• The code follows best practices and conventions.
• The changes implement the desired functionality or fix the reported issue.
• The tests cover the new changes and pass successfully.
• Any potential edge cases or error scenarios have been considered.

[codecov]

Codecov Report

Attention: Patch coverage is 85.00000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 95.18%. Comparing base (65f9563) to head (a869162).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/recordlinker/hl7/fhir.py	82.85%	6 Missing ⚠️
src/recordlinker/routes/link_router.py	88.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #102      +/-   ##
==========================================
- Coverage   95.33%   95.18%   -0.16%     
==========================================
  Files          24       25       +1     
  Lines        1158     1183      +25     
==========================================
+ Hits         1104     1126      +22     
- Misses         54       57       +3     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[ericbuckley]

@cbrinson-rise8 looks great, just made 1 small change to a docstring