Add Previous Link

[LTA-Thinking]

Description

Adds support for previous links in search bundles. This is optional behind a header "x-ms-add-previous-link". This works in both Cosmos and SQL services, but due to Cosmos continuation tokens already being rather long I wouldn't recommend using it with a Cosmos service.

Related issues

Addresses [issue #].

Testing

Currently just manual test, will add unit and E2E if team decides to take on the new feature.

FHIR Team Checklist

• Update the title of the PR to be succinct and less than 65 characters
• Add a milestone to the PR for the sprint that it is merged (i.e. add S47)
• Tag the PR with the type of update: Bug, Build, Dependencies, Enhancement, New-Feature or Documentation
• Tag the PR with Open source, Azure API for FHIR (CosmosDB or common code) or Azure Healthcare APIs (SQL or common code) to specify where this change is intended to be released.
• Tag the PR with Schema Version backward compatible or Schema Version backward incompatible or Schema Version unchanged if this adds or updates Sql script which is/is not backward compatible with the code.
• CI is green before merge
• Review squash-merge requirements

Semver Change (docs)

Patch

[LTA-Thinking]

/azp run

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