denicija d208815685 iOS/MacOS:Refactor metal rendering by extracting common implementation
in separate super class.

Included changes:
- Fix rendering on iOS to support NV12 and i420 frames
- Improve code style
- Update build targets
- Update tests

BUG=webrtc:7079

Review-Url: https://codereview.webrtc.org/2784243003
Cr-Commit-Position: refs/heads/master@{#17923}
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