Added copy button implementation that works both in React + jinja.
Moved identifiers field from nr-model, as it turns out that you could need it outside of the context of "nr". For example, some specialized vocabulary items have identifiers as well that also have shape scheme + identifier.
I will remove from nr-model + refactor other places where it is used when making refactoring to nr-docs form (for implementing RDM funders/creatibutors) in order to not make things more complicated now with additional PRs.
What's Changed
* Stojanovic/fe 345 need reusable copy action for react part we have for jinja by Ducica in https://github.com/oarepo/oarepo-ui/pull/289
**Full Changelog**: https://github.com/oarepo/oarepo-ui/compare/5.2.50...5.2.51