add torch_flip op

[Baiyuetribe]

trafficstars

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

已完结

[tencent-adm]

Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[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 :warning:

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     

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

:rocket: New features to boost your workflow:

• :snowflake: Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[nihui]

closed for https://github.com/Tencent/ncnn/pull/6233