Add level of theory flags

[joehart2001]

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Summary

• add level of theory to metric and model yaml
• add level of theory mismatch flag and MLIP tooltip for model info
• add level of theory to each metric tooltip

Linked issue

Resolves #121

Testing

mace models

[ElliottKasoar]

Rebased

I get some strange spacings for some of the warnings:

I also don't seem to get any hover info for the theory on several of the benchmarks e.g. LNCI16, even though the level_of_theory is present in the metrics.yml?

[ElliottKasoar]

I think we also want some sort of list of known levels of theory (e.g. via a set of Literal strings. Currently we have clashes e.g.

Obviously we could do things like compare lowercase strings, but there will be less trivial alternatives to how things are written, and we also don't really want these inconsistencies, even if we catch them.