[Assets] AssetCompiler uses spatialized flag for channel count

[adrsch]

Version: 4.1.0.1

Describe the bug
Instead of detecting the channel count from the audio file, or as an explicit import option, the spatialized flag is used to set the channel count to 1 if true, 2 if false.

To Reproduce
Steps to reproduce the behavior:

1. Import a mono wav file without the "spatialized" flag set.
2. Try to play from an Audio emitter component
3. It will give you an exception that the channel count is greater than 1

Expected behavior
A mono file will be imported with a channel count of 1.

Screenshots
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Log and callstacks
This is caused by SoundAssetCompiler.DoCommandOverride, line 54.

[adrsch]

Reading into this a bit, ffmpeg does not seem to be recommended for getting this kind of info - instead, ffprobe is recommended.

It's usually bundled in downloads of ffmpeg, but it isn't included with Stride currently. So that path for solving the bug would be to add ffprobe as a dependency, and use it for channel info (also, we could use it for sample rate too)