generic json engine

[omarismail94]

IMPORTANT: All PRs must be linked to an issue (except for extremely trivial and straightforward changes).

Fixes #[issue number]

Description Clear and concise code change description.

Alternative(s) considered Have you considered any alternatives? And if so, why have you chosen the approach in this PR?

Type Choose one: (Bug fix | Feature | Documentation | Testing | Code health | Builds | Releases | Other)

Screenshots (if applicable)

Checklist

• [ ] I have read and acknowledged the Code of conduct.
• [ ] I have read the Contributing page.
• [ ] I have signed the Google Individual CLA, or I am covered by my company's Corporate CLA.
• [ ] I have discussed my proposed solution with code owners in the linked issue(s) and we have agreed upon the general approach.
• [ ] I have run ./gradlew spotlessApply and ./gradlew spotlessCheck to check my code follows the style guide of this project.
• [ ] I have run ./gradlew check and ./gradlew connectedCheck to test my changes locally.
• [ ] I have built and run the demo app(s) to verify my change fixes the issue and/or does not break the demo app(s).

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (oi/non-fhir@4911eac). Click here to learn what that means. The diff coverage is n/a.

:exclamation: Current head 58ab7cb differs from pull request most recent head 957f28a. Consider uploading reports for the commit 957f28a to get more accurate results

@@              Coverage Diff               @@
##             oi/non-fhir    #1527   +/-   ##
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  Coverage               ?   75.04%           
  Complexity             ?      704           
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  Files                  ?      134           
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  Hits                   ?     3185           
  Misses                 ?      654           
  Partials               ?      405           

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[dubdabasoduba]

@omarismail94 Do you mind linking the issue this is trying to solve? I would love to review some FHIR Core implementations we have.