[Feature]: Find a file parser for C++ tests

[Bai-Li-NOAA]

Is your feature request related to a problem? Please describe.

Currently FIMS uses RapidJson for C++ integration tests and includes a copy of the RapidJson repo inside of FIMS. It would be good to review available options and figure out how to include another repo inside of FIMS.

Describe the solution you would like.

• review available Json (or other file types) parsers/generators and select one for long term use
• follow the best practice to include other projects/repos inside FIMS. For example, Git submodules can keep a Git repository as a subdirectory of another Git repository. This lets us clone another repository into your project and keep your commits separate.

Describe alternatives you have considered

Continue using RapidJson.

Statistical validity, if applicable

No response

Describe if this is needed for a management application

No response

Additional context

No response

Code of Conduct

• I agree to follow this project's Code of Conduct