[enhancement]: Command-line script to remove orphaned model files

[lstein]

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What should this feature add?

I'd like a command-line script, located in scripts, which removes orphaned model files from the INVOKEAI_ROOT directory.

Orphaned models are ones that appear in the INVOKEAI_ROOT/models directory, but which are not referenced in the database models table. When run without command-line arguments, the script should list all the orphaned model directories it finds and ask for confirmation to delete them. Other arguments are:

--root       Specify an INVOKEAI_ROOT directory. The $INVOKEAI_ROOT environment variable also controls this.
--delete     Delete orphan model files without asking

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Additional Content

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