feat: compare lam statistics

[icedoom888]

Description

Adding a new command to compare statistics withing a LAM region across 2 datasets.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Issue Number

Closes #202

Code Compatibility

• I have performed a self-review of my code

Code Performance and Testing

• I have added tests that prove my fix is effective or that my feature works
• I ran the complete Pytest test suite locally, and they pass

Dependencies

• I have ensured that the code is still pip-installable after the changes and runs
• I have tested that new dependencies themselves are pip-installable.

prettytable
print_color
termcolor

Documentation

• My code follows the style guidelines of this project
• I have updated the documentation and docstrings to reflect the changes
• I have added comments to my code, particularly in hard-to-understand areas

Added New command: compareLAM

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📚 Documentation preview 📚: https://anemoi-datasets--203.org.readthedocs.build/en/203/

[FussyDuck]

All committers have signed the CLA.

[icedoom888]

All failed checks are related to issues and code not affected by this PR.

[github-actions]

Caution

This pull request contains changes to GitHub workflows!
Proceed with caution and if not sure, contact your GitHub admin.

[b8raoult]

Hi, just some stylistic changes, so that the command follow the same style as the others (use of hyphens in name instead of underscore and came case):

• Rename the command to compare-lam
• Rename arguments such as --num_dates to --number-of-dates
• Use single letter for short option (e.g. -D instead of -nd)

Also, can you move the import cartopy, import prettytable etc, from the top of the file into the functions/methods using them, so we avoid loading them unnecessarily when not calling the command. This is because all the commands are loaded even if they are not called.