[Feature Request]: Option to control cached thumbnail file compression

[kitsumed]

Checklist

• I am using an up-to-date version.
• I have read the documentation.
• I have searched existing issues.

Description

Currently Thumbnail caching #694 cache thumbnails with the default compression settings of PIL for webp. While the thumbnail caching feature already implements some features to reduces the file size like resizing the picture, caching may still grow big on large library.

Solution

Having an option to control compression levels or directly increase compression would make the cache size even smaller. As thumbnails are displayed in low resolution in the preview box, compression on images would be less notified anyway while reducing size, write and read operations (yes, probably a reduction in kb, but imagine a very large library with lots of cache, that's still an good improvement).

Alternatives

No response