YAML and LinkML auto-formatting and enumeration auto-describing

[turbomam]

This PR adds a mechanism for

• normalizing the YAML format of mixs.yaml
• using a succinct LinkML for for dictionaries like prefixes
• omitting inferrable meatslots like the text of permissible values

It also inherits auto-describing of any enum that lacks a description from

• #872

For future discussion:

• [ ] do we want empty curly brackets for keys without values?
• [ ] be careful about patterns that are longer than the current max line length , 79 -what technology should we use to check that?
• [ ] how to visualize the changes from yamlfmt (or the previous steps?)

[sujaypatil96]

@turbomam to split it out into 2 PRs.

[jfy133]

More autoformatting the better! Does this then occur/get applied during GitHub actions validation?

[turbomam]

src/scripts/describe_enums_by_slots_using.py can be eliminated thanks to the new type-ignoring linkml linter