FHIR Gateway Enhancements

[ndegwamartin]

IMPORTANT: Where possible all PRs must be linked to a Github issue

In this PR

• Fix REL sync strategy Caching bug
• Refactor to support returning all paginated results
• Refactor REL upstream fetch to single request
• Pagination count bumped to 200
• Release version 2.1.2

Engineer Checklist

• [ ] I have written Unit tests for any new feature(s) and edge cases for bug fixes
• [ ] I have added documentation for any new feature(s) and configuration option(s) on the README.md
• [ ] I have run mvn spotless:check to check my code follows the project's style guide
• [ ] I have run mvn clean test jacoco:report to confirm the coverage report was generated at plugins/target/site/jacoco/index.html
• [ ] I ran mvn clean package right before creating this pull request.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 78.50467% with 46 lines in your changes missing coverage. Please review.

Project coverage is 67.61%. Comparing base (01da39e) to head (23ce64a).

Files with missing lines	Patch %	Lines
.../fhir/gateway/plugins/PermissionAccessChecker.java	27.58%	20 Missing and 1 partial :warning:
...ister/fhir/gateway/plugins/SyncAccessDecision.java	84.42%	10 Missing and 9 partials :warning:
.../org/smartregister/fhir/gateway/plugins/Utils.java	89.28%	3 Missing and 3 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #92 +/- ## ============================================ + Coverage 61.54% 67.61% +6.07% - Complexity 206 247 +41 ============================================ Files 16 16 Lines 1412 1541 +129 Branches 164 184 +20 ============================================ + Hits 869 1042 +173 + Misses 458 402 -56 - Partials 85 97 +12 ```

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