fix: nv21 update

[juliansteenbakker]

Since camera2 1.5.0, the analysis input can be NV21. This means we can directly convert the image to bitmap, and remove the deprecated renderscript API.

Fixes #1142

Can be merged after #1530

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.35%. Comparing base (3d8565f) to head (0bbb29e).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1533   +/-   ##
========================================
  Coverage    38.35%   38.35%           
========================================
  Files           42       42           
  Lines          996      996           
========================================
  Hits           382      382           
  Misses         614      614           

Flag	Coverage Δ
unittests	38.35% <ø> (ø)

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[juliansteenbakker]

@navaronbracke i seem to be getting some weird artifacts in the returnImage. Can you maybe check if you're having the same issue? Maybe it's something related to my test device.

[navaronbracke]

I'll check on this branch

[juliansteenbakker]

@navaronbracke I've updated the format back to yuv, and used the built in toBitmap function, which seems to be working fine. I've moved analysis to a different thread, and added coroutines for the bitmap functions to prevent the main ui thread from blocking.

I think it's ready to merge, and would be a nice update since it removes all deprecated renderscript api's

[navaronbracke]

LGTM! This needs a changelog update, too?