NCNN resize_nearest

[obtx]

Implement resize_nearest function in NCNN

[tencent-adm]

All committers have signed the CLA.

[lgtm-com[bot]]

This pull request fixes 7 alerts when merging 702c5c6d899d3f818e4ef08b65eff68b1b74068d into a12cd7c212d50f203c5ea56601047048f0ae308b - view on LGTM.com

fixed alerts:

• 5 for Multiplication result converted to larger type
• 1 for Comparison result is always the same
• 1 for FIXME comment

[codecov-commenter]

Codecov Report

Merging #4016 (22617a6) into master (43912c7) will decrease coverage by 2.70%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #4016      +/-   ##
==========================================
- Coverage   93.89%   91.18%   -2.71%     
==========================================
  Files         728      698      -30     
  Lines      177006   161862   -15144     
==========================================
- Hits       166200   147600   -18600     
- Misses      10806    14262    +3456     

Impacted Files	Coverage Δ
src/mat.h	89.66% <ø> (-0.21%)	:arrow_down:
src/mat_pixel_resize.cpp	80.86% <0.00%> (-17.86%)	:arrow_down:
src/layer/x86/convolution_2x2_pack8.h	2.75% <0.00%> (-97.25%)	:arrow_down:
src/layer/x86/deconvolution_pack8.h	10.76% <0.00%> (-89.24%)	:arrow_down:
src/layer/x86/convolution_sgemm_pack8.h	14.24% <0.00%> (-85.24%)	: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/arm/convolution_3x3_pack1to4_bf16s.h	35.25% <0.00%> (-63.90%)	:arrow_down:
src/layer/x86/convolution_pack4to8.h	42.85% <0.00%> (-55.11%)	:arrow_down:
src/layer/arm/convolution_sgemm_pack1to4_bf16s.h	48.37% <0.00%> (-49.86%)	:arrow_down:
... and 234 more

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[obtx]

The code documentation is as follows : 【腾讯文档】ncnn resize_nearest 文档 https://docs.qq.com/doc/DTGFNcmVDUGlDaWtM