[PATCH] http_image_filter_module: Add HEIC and AVIF support / Add output format option

[bes]

Hi, Alex.

With your patch and this configuration:
 image_filter resize 10000000 -; (something wider than input image)
 image_filter convert webp;
no conversion occurs but return headers contain content-type: image/webp

I expect that when specifying the conversion filter it will apply anyway.
Most likely there is a shortcut somewhere in the algorithm, where after the
condition code goes directly to the output, but I could not find it.
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