Add FHIR resolver example script

[alex-omophub]

• Introduced a new script fhir_resolver.py that demonstrates FHIR-to-OMOP concept resolution using the OMOPHub SDK.
• The script includes examples for resolving SNOMED, ICD-10-CM, LOINC, RxNorm codes, and text-only semantic searches.
• Added functionality for direct standard lookups, non-standard code mapping, and Phoebe recommendations.
• Supports batch resolution and asynchronous usage for improved performance.

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Summary by cubic

Adds an example script to demonstrate FHIR-to-OMOP concept resolution with omophub, covering direct lookups, mappings, semantic search, batch, and async usage. Helps users map FHIR system+code or text to OMOP concepts, target tables, and optional Phoebe recommendations in one call.

• New Features
  • Direct SNOMED/LOINC/RxNorm lookups; ICD-10-CM “Maps to” traversal; vocabulary_id bypass.
  • Text-only semantic search; mapping quality signal; Phoebe recommendations.
  • Batch resolution with per-item errors; async client examples.
  • CodeableConcept resolution with vocabulary preference and text fallback.

^{Written for commit 9292470. Summary will update on new commits.}

[codecov]

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