ENH: Add functions for File entities

For https://gitlab.indiscale.com/caosdb/customers/cfaed/management/-/issues/29. This introduce a specific treatment of file entities and some other helper functions. This MR also introduces the retrieval with multiple ids.

Test together with f-inline-references branch of complexity wiki (use server profile in local-inline-references). npm pack this repo, then npm install it in the complexitywiki and start the react app. Verify that the functionality introduced here (files, Property.isList, and multi-ID retrieve) work as expected.

assigned to @florian

resolved all threads

added 1 commit

• c2636292 - Apply 1 suggestion(s) to 1 file(s)

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added 1 commit

• 82841cb3 - MAINT: Use `new Error`

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mentioned in commit 5a74f98a

merged