avcodec/encode:: generate ICC profiles

Only if requested, and only if the codec signals support for ICC
profiles. Implementation roughly matches the functionality of the
existing vf_iccgen filter, albeit with some reduced flexibility and no
caching.

Ideally, we'd also only do this on the first frame (e.g. mjpeg, apng),
but there's no meaningful way for us to distinguish between this case
and e.g. somebody using the image2 muxer, in which case we'd want to
attach ICC profiles to every frame in the stream.

Closes: #9672

Signed-off-by: Niklas Haas <git@haasn.dev>

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