feat: save image names to keep track of unicity #16
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Description
This PR adds a list of image names to the xblock definition to easily keep track of already-existent image names, this way, we can have duplicates without the system failing.
How to test
This PR also fixes the following bug: try deleting two images and re-uploading them in a single operation (without closing the edit Studio view). You should be able to see the images you uploaded