Add support in Everest.cs for accessing Version Branch

**I am planning on implementing this myself**
No

> A `VersionBranch` field in `Everest` similar to the ones linked below would also be useful, as I wanted some system in place for Everest to be able to warn regular end users when a development version is installed. The xmldocs should also be updated to reflect the new build format.
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> *Also, now that I look at it, the comment for `VersionCommit` is incorrect... it should say "commit" instead of "tag".*
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> https://github.com/EverestAPI/Everest/blob/cfa08a59bba69f7b0619f9f665fab562f2a59ea8/Celeste.Mod.mm/Mod/Everest/Everest.cs#L39-L58

Is this planned to be implemented in this PR or a future one?

_Originally posted by @SnipUndercover in https://github.com/EverestAPI/Everest/issues/918#issuecomment-2962906182_