Add neon acceleration for rgb and rgb to yuv conversions

[fabiosky]

Issue #, if available:

Description of changes:
This patch adds neon acceleration (arm, aarch64) for rgb and rgb to yuv conversions

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 71.11111% with 13 lines in your changes missing coverage. Please review.

Project coverage is 60.33%. Comparing base (c86b531) to head (1556cfd).
Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
src/convert_image/avx2.rs	0.00%	13 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master      #93       +/-   ##
===========================================
- Coverage   84.47%   60.33%   -24.15%     
===========================================
  Files           8        8               
  Lines        2757     4679     +1922     
===========================================
+ Hits         2329     2823      +494     
- Misses        428     1856     +1428     

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