Apple api add CVPixelBuffer、CMSampleBuffer、UIImage convenient

[DaChengTechnology]

[codecov-commenter]

Codecov Report

Merging #3800 (38bdb98) into master (9376ba7) will decrease coverage by 0.52%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3800      +/-   ##
==========================================
- Coverage   92.98%   92.45%   -0.53%     
==========================================
  Files         709      728      +19     
  Lines      176425   176467      +42     
==========================================
- Hits       164049   163154     -895     
- Misses      12376    13313     +937     

Impacted Files	Coverage Δ
src/allocator.h	87.50% <ø> (ø)
src/mat.h	89.82% <ø> (-0.06%)	:arrow_down:
src/layer/x86/convolution_2x2_pack8.h	2.75% <0.00%> (-97.25%)	:arrow_down:
src/layer/x86/convolution_sgemm_pack8.h	14.24% <0.00%> (-85.24%)	:arrow_down:
src/layer/x86/deconvolution_pack8.h	20.00% <0.00%> (-80.00%)	:arrow_down:
src/layer/x86/convolution_sgemm_pack4to8.h	29.16% <0.00%> (-70.84%)	:arrow_down:
src/layer/x86/convolution_pack8.h	34.42% <0.00%> (-65.58%)	:arrow_down:
src/layer/x86/convolution_pack4to8.h	42.85% <0.00%> (-55.11%)	:arrow_down:
...c/layer/x86/convolution_winograd_transform_pack8.h	54.90% <0.00%> (-45.10%)	:arrow_down:
src/layer/x86/convolution_3x3_pack1to8.h	39.95% <0.00%> (-40.04%)	:arrow_down:
... and 156 more

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[nihui]

todo: apply coding style for mm sources wrap platform specific features with NCNN_PLATFORM_API macro add some tests

[DaChengTechnology]

How do you passed the < build shared >check?

[tencent-adm]

All committers have signed the CLA.