Modern diag_manager: Simplify the diag table yaml

[uramirez8707]

Description
This simplifies the diag table yaml by allowing the module, reduction and kind to be set at a file level, with the ability to override them at a field level.

This is backwards compatible as the old diag table yaml formats should still work.

Fixes #1542
How Has This Been Tested?
CI, including added test

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• New check tests, if applicable, are included
• make distcheck passes

[thomas-robinson]

Is there an update to the schema?

[uramirez8707]

Is there an update to the schema?

@thomas-robinson NOAA-GFDL/gfdl_msd_schemas#3