Implement "DELETE /objects/{object_id}/access/{access_id}"

[uniqueg]

Description

As in issue #10 and PR #9, but for deleting an access method rather than an object. Note that at least one access method always has to be available for a given object.

Proposed solution

• Add an endpoint DELETE /objects/{object_id}/access/{access_id} to the custom DRS-Filer specification.
• Implement the controller for the new endpoint
• Ensure that the last available access method cannot be deleted (issue a 400/BadRequest response if attempted to)
• Add/update unit tests

Compare the DELETE /tools/{id}/versions/{version_id} controller for an example on how to make sure that the last list item (here: a tool version) cannot be deleted.

[chinvib66]

@uniqueg I would like to take up this issue.

[uniqueg]

That's awesome, @chinvib66, you are very welcome to do so!