WIP Allow more dataset CRUD via API

[fm3]

URL of deployed dev instance (used for testing):

• https://___.webknossos.xyz

Steps to test:

• abc

TODOs:

• RemoteAttachments.delete_attachment
  • Backend needs to respect missing attachments in updatePartial call
    • ensure frontend or older libs versions don’t already skip the attachments?
    • ensure libs don’t drop attachments on updates when opened via zarr streaming? →LIBS
    • bump API version to v13, ignore attachment changes on older (otherwise we lose attachments unwanted)
• RemoteAttachments.rename_attachment
• RemoteDataset.add_layer_as_ref (linked layer)
  • Needs new protocol similar to compose (ensure permission checks)
• RemoteLayer.add_mag_as_ref (linked mag)
  • Same as above
• RemoteAttachments.add_attachments_as_ref
  • Same as above
• RemoteLayer.add_mag_as_copy with transfer_mode=HTTP
  • Needs new upload protocol. Use resumable here too?
• RemoteAttachments.add_attachment_as_copy with transfer_mode=HTTP
  • Needs new upload protocol (analog to mag)
• Determine which updates are allowed for non-virtual datasets, make sure those work, make sure others are rejected

Issues:

• fixes #

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(Please delete unneeded items, merge only when none are left open)

• Added changelog entry (create a $PR_NUMBER.md file in unreleased_changes or use ./tools/create-changelog-entry.py)
• Added migration guide entry if applicable (edit the same file as for the changelog)
• Updated documentation if applicable
• Adapted wk-libs python client if relevant API parts change
• Removed dev-only changes like prints and application.conf edits
• Considered common edge cases
• Needs datastore update after deployment

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