MAT-7373: Include the FHIR Bundle returned from VSAC FHIR Term Service in the Value Set search response

[jkotanchik-SB]

Terminology Service PR

Jira Ticket: MAT-7373
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Summary

Include the FHIR Bundle that comes back from VSAC's FHIR Terminology Service when searching for Value Sets in our search API's response. The entries of which will be displayed as value set "details" to the user when requested.

Note: The Bundle is returned as a String because the typed Bundle object is excessively huge when serialized to JSON as the FHIR Parser inits null/empty values by default.

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DevSecOps

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• This PR has NO significant security impact (i.e Changing auth methods, Adding a new user type, Adding a required but vulnerable package).

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• The tests appropriately test the new code, including edge cases.
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