Adding LESFMIP and Automating CV generation

[wolfiex]

• Added LESF MIP related items
• Automated CV creation on push.
• Reorganisation of the CVs and their structure.
• Additional metadata added.

[matthew-mizielinski]

Update: some old version headers remain (e.g. CMIP6Plus_experiment_id)

[wolfiex]

Versioning implementation functional: awaiting comments or review.

@durack1 @matthew-mizielinski

[matthew-mizielinski]

Nice work @wolfiex. I'm happy for you to tag and release at your leisure.