Add netcdf debugging utilities

[SeanBryan51]

This change adds a module for common NetCDF utilities and includes a to_netcdf subroutine to aid with debugging.

Type of change

• New or updated documentation

Checklist

• The new content is accessible and located in the appropriate section
• I have checked that links are valid and point to the intended content
• I have checked my code/text and corrected any misspellings

Testing

• Are the changes bitwise-compatible with the main branch? If working on an optional feature, are the results bitwise-compatible when this feature is off? If yes, copy benchcab output showing successful completion of the bitwise compatibility tests or equivalent results below this line.

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📚 Documentation preview 📚: https://cable--550.org.readthedocs.build/en/550/

[SeanBryan51]

• Support for other types and and dimensions
• Ford documentation
• Code formatting
• Testing

[ccarouge]

@SeanBryan51 In the API documentation, could we add some indication these subroutines are not to be used to add routine outputs from CABLE because the resulting netcdf files do not provide the required level of information. New outputs for the CABLE model should be implemented in cable_output.F90.
Just to prevent future confusion.