Add support for administrative levels search parameters on LocationHierarchy endpoint

[lincmba]

Resolves https://github.com/onaio/fhir-gateway-extension/issues/64

Engineer Checklist

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

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 76.47059% with 12 lines in your changes missing coverage. Please review.

Project coverage is 46.23%. Comparing base (d7eeb69) to head (2b42764). Report is 14 commits behind head on main.

Files	Patch %	Lines
...teway/plugins/LocationHierarchyEndpointHelper.java	86.66%	2 Missing and 4 partials :warning:
...ay/plugins/endpoint/LocationHierarchyEndpoint.java	0.00%	5 Missing :warning:
...way/plugins/PractitionerDetailsEndpointHelper.java	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #66 +/- ## ============================================ + Coverage 43.81% 46.23% +2.42% - Complexity 106 125 +19 ============================================ Files 15 15 Lines 1075 1129 +54 Branches 120 134 +14 ============================================ + Hits 471 522 +51 + Misses 545 543 -2 - Partials 59 64 +5 ```

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