Upload: Add support for uploading zip archives

[lastzero]

As a user who wants to upload many files, I would like to be able to upload zip archives to improve performance and reduce manual work when downloading pictures from one instance and then uploading them to another.

Related Issues:

• Upload: Restrict file extensions and total size of Web uploads #4895
• Upload: Allow re-upload of selected files if they failed #3965

[lastzero]

This can soon be tested with our updated development preview build:

• https://docs.photoprism.app/release-notes/#development-preview

Support for zip archive uploads can then be enabled by setting PHOTOPRISM_UPLOAD_ARCHIVES to "true":

Environment	CLI Flag	Default	Description
PHOTOPRISM_UPLOAD_NSFW	--upload-nsfw		allow uploads that might be offensive (detecting unsafe content requires TensorFlow)
PHOTOPRISM_UPLOAD_ALLOW	--upload-allow		restrict uploads to these file types (comma-separated list of EXTENSIONS; leave blank to allow all)
PHOTOPRISM_UPLOAD_ARCHIVES	--upload-archives		allow upload of zip archives (will be extracted before import)