ROCrate-Converter (also for .eln-files)

Summary

This MR adds:

• ELNFileConverter
• ROCrateConverter
• ROCrateEntityConverter

So .eln files and their contents can be crawled, including traversal of hasPart and integrated files.

This MR includes a set of tests for the new functionality.

Open points:

• How to handle the dependency to a patched version of ro-crate-py
  • Use my fork: https://github.com/salexan2001/ro-crate-py/tree/f-automatic-dummy-ids ?
  • Clean solution would be to fix the .eln files: https://github.com/TheELNConsortium/TheELNFileFormat/issues/89
• User Documentation -> https://gitlab.indiscale.com/caosdb/customers/f-fit/management/-/issues/50
• Integration or system tests, testing the scanner or complete crawler runs.

Test Environment

There are tests provided.

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