[Feature] Round trip photo editing

The feature At the moment there's lots of options for self hosted photo managers, but as far as I can tell *none* of them support what I would consider core functionality for a photo manager intended to run on a server - round trip photo editing. I know that there's loads of people out there with massive backlogs of RAW photos and such that need sorting and editing, but so far the only suggestion to fix this seems to be to include a basic photo editor in Immich - which is undesirable because it adds a lot of complexity and will never compete with dedicated photo editors. Instead, what I propose is a workflow for client side photo editing. This would consist of the ability to expose a set of photos in a batch via WebDAV to a client where the user could edit that photos with their choice of image editor, and on dismount Immich would update any edited files, and import any new files including relevant sidecars and edited versions of the images. I expect this would be eas…