Enable yaml support in FMS

[mathomp4]

Description

This PR enables yaml support in FMS

Dependencies

None

Issues addressed

Closes #1943 by @sanAkel

Applications affected

Anything using FMS (GEOS, FV3, MOM6, ...) but YAML use is optional. This just enables the ability for FMS to use YAML for diag_manager (see https://github.com/NOAA-GFDL/FMS/blob/5896f4655b4ae949dfd31dab1dddb6dc7efa32ee/diag_manager/diag_yaml_format.md)

Systems affected

All

Testing

• CI: Note whether the automatic tests (GitHub actions tests that run automatically for every commit) pass or not
  • GitHub actions CI tests pass
  • GitHub actions CI tests do not pass (provide explanation)
  • GitHub actions CI tests skipped (provide explanation if necessary)
• New tests added: List and describe any new tests added to GitHub actions
  • ...
• Additional testing: Add information on any additional tests conducted
  • ...

Checklist

• This PR addresses one issue/problem/enhancement or has a very good reason for not doing so.
• These changes have been tested on the affected systems and applications.
• All dependency PRs/issues have been resolved and this PR can be merged.
• All necessary updates to the documentation (spack-stack wiki) will be made when this PR is merged