Protocol as first-class citizens

[kMutagene]

I propose that we implement Protocols the same way that we handle workflows in the next major toolstack update.

Namely, i think lab protocols should have their own top-level folder, and their own data model object, so that they can be re-used in all studies/assays, and have their own associated metadata (e.g., ontologized parameters). Protocols are the wet-lab equivalent of workflows, and i think we should offer their annotation and use the exact same way.

Also related: https://github.com/orgs/nfdi4plants/discussions/26, as this would enable re-using protocols from other arcs

cc @Freymaurer @HLWeil