pnnx convert torch round trunc

[nihui]

No description provided.

[codecov-commenter]

Codecov Report

Merging #4813 (a2f130d) into master (9022b71) will increase coverage by 0.29%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4813      +/-   ##
==========================================
+ Coverage   94.90%   95.19%   +0.29%     
==========================================
  Files         779      730      -49     
  Lines      223105   202330   -20775     
==========================================
- Hits       211734   192618   -19116     
+ Misses      11371     9712    -1659     

Impacted Files	Coverage Δ
src/layer/riscv/convolution1d_riscv.cpp	99.08% <ø> (ø)
src/layer/arm/unaryop_arm.cpp	99.28% <100.00%> (+0.10%)	⬆️
src/layer/arm/unaryop_arm_asimdhp.cpp	99.62% <100.00%> (+0.03%)	⬆️
src/layer/loongarch/unaryop_loongarch.cpp	99.44% <100.00%> (+0.01%)	⬆️
src/layer/mips/unaryop_mips.cpp	99.45% <100.00%> (+0.02%)	⬆️
src/layer/riscv/convolution_packn_fp16s.h	100.00% <100.00%> (ø)
src/layer/riscv/unaryop_riscv.cpp	100.00% <100.00%> (ø)
src/layer/unaryop.cpp	98.98% <100.00%> (+0.13%)	⬆️
src/layer/x86/unaryop_x86.cpp	99.59% <100.00%> (+0.04%)	⬆️

... and 65 files with indirect coverage changes