feat(server): hardware decoding, libplacebo for tone-mapping

[mertalev]

Description

Edit: Reducing the scope of this PR to only change the process for NVENC and possibly QSV and VAAPI depending on Vulkan support. This is because Vulkan is quite new in FFmpeg and we would need a more bleeding edge version to use it more extensively. For the time-being, this does unfortunately mean we essentially have 3 ways of tone-mapping: zscale (CPU), Vulkan (NVENC and maybe QSV and VAAPI) and OpenCL (RKMPP).

This PR overhauls the decoding and tone-mapping behavior for hardware-accelerated transcoding:

• Vulkan-based pipeline shared across all devices, including CPU
  • CPU on Vulkan works, but with a roughly %30 slowdown compared to the existing pipeline, likely overhead from the upload/download process. So the existing pipeline will still be used for CPU.
  • Decoding is still done through device-specific APIs, but can be done through Vulkan as well in the future
• Codec and API-specific logic is reduced to encoding
• libplacebo (used in mpv) allows for feature-rich and zero-copy hardware tone-mapping
• All backends have access to the same set of tone-mapping options

How Has This Been Tested?

Tested on CPU and NVENC for both transcoding and video thumbnails. Keeping this in draft until it's been tested with the other APIs.

Fixes #4321
Fixes #8411

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[mertalev]

Closing in favor of #9452