VideoEncoderConfig interface should have hevc attribute

[yaruno]

See #2025 for more details

[github-actions]

Thanks for the PR!

This section of the codebase is owned by @saschanaz - if they write a comment saying "LGTM" then it will be merged.

[yaruno]

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[saschanaz]

This is still true, which makes this PR invalid.

[yaruno]

Closing this for now as above is true. Leaving here note for future reference that hevc codecs are supported on safari browser too, but for some reason they haven't included video encoder config parameters into the webkit browser engine webcodecs implementation for hevc/h265.