[REQUEST] Use Media Foundation SDK for hardware accelerated video encode and decode on Windows

Is your feature request related to a problem? Please describe.
Hardware accelerated decoding on windows is currently unavailable, and based on how it is being implemented, will likely be limited to NVIDIA GPUs only.

Describe the solution you'd like
Rather than directly integrate with vendor SDKs to support hardware accelerated encode/decode, use the Media Foundation SDK from Microsoft, which provides an abstract interface to hardware encoders and decoders, and relies on GPU vendors to enable hardware encode and decode support via their graphics drivers. This will ultimately reduce the development and maintenance burden on Unity by obviating the need to develop specific integrations for each GPU vendor, and will unlock cross-vendor hardware encoding and decoding support all at once.

Describe alternatives you've considered
On Windows, Media Foundation this is the standard way to support hardware acceleration in video applications at the OS level.

Additional context