add torch_flip op

[Baiyuetribe]

• pass_ncnn
• 1D
• 2D
  • w
  • h
  • w & h
• 3D
  • w
  • h
  • c
  • w & h
  • w & c
  • h & w
  • w & h & c
• 4D
  • d
  • c
  • h
  • w
  • dc
  • dh
  • dw
  • ch
  • cw
  • hw
  • dch
  • dcw
  • dhw
  • chw
  • whcd
• ctest
• pytest
• sim_stl
• std++03
• 跨端兼容性
• pnnx_ci

已完结

[tencent-adm]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 99.16667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 95.11%. Comparing base (ace8372) to head (b54643e).
Report is 155 commits behind head on master.

Files with missing lines	Patch %	Lines
src/layer/flip.cpp	99.16%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #5872    +/-   ##
========================================
  Coverage   95.10%   95.11%            
========================================
  Files         824      825     +1     
  Lines      277477   277719   +242     
========================================
+ Hits       263904   264144   +240     
- Misses      13573    13575     +2     

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[nihui]

closed for #6233