Add EXTRA_PARAMS_CROP_INTERESTING

[n0vad3v]

Related to: #327

This PR will add a config parameter called EXTRA_PARAMS_CROP_INTERESTING in config.json, and WEBP_EXTRA_PARAMS_CROP_INTERESTING in environment variable.

Available options for EXTRA_PARAMS_CROP_INTERESTING are:

• InterestingNone
• InterestingCentre
• InterestingEntropy
• InterestingAttention
• InterestingLow
• InterestingHigh
• InterestingAll

This will allow users to select what kind of crop interest when using EXTRA_PARAMS and both width and height are supplied.

More about Extra Parameters: https://docs.webp.sh/usage/extra-params/#extra-parameters
More examples about different Interesting: https://blog.webp.se/vips-crop-en/

[github-actions]

ghcr.io/webp-sh/webp_server_go (debian 12.5)
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