fix: make android object detection rectangles correct

[cdiddy77]

There are a bunch of things tied up in here:

• remove libyuv stuff which is no longer necessary with RNVC v4
• change how we do inference in the frame processor, instead of using the C++ code, we have to handle the rotation ourselves -- RNVC does not do this, see here
• RNVC also does not handle mirroring correctly -- on android. So we do it in the typescript layer, which is a little obtrusive, but works.
• Added a bunch of tests for all of the frame to view conversion code, which, with cover/contain and mirroring, is really touchy.

result is that it works pretty well.

[dwgray]

LGTM