Add content-type filter method to folder_paths (#4054)
* Add content-type filter method to folder_paths * Add unit tests * Hardcode webp content-type * Annotate content_types as Literal["image", "video", "audio"]
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* Add content-type filter method to folder_paths * Add unit tests * Hardcode webp content-type * Annotate content_types as Literal["image", "video", "audio"]