[Enhancement] Add distributed scripts

[wutongshenqiu]

Motivation

Add scripts for simplify distributed training/searching/testing.

Modification

tools/xxx/dist_xxx.sh.

Checklist

Before PR:

• Pre-commit or other linting tools are used to fix the potential lint issues.

[codecov]

Codecov Report

Merging #105 (4623b10) into master (c5a097b) will decrease coverage by 0.59%.
The diff coverage is n/a.

❗ Current head 4623b10 differs from pull request most recent head ef23c62. Consider uploading reports for the commit ef23c62 to get more accurate results

@@            Coverage Diff             @@
##           master     #105      +/-   ##
==========================================
- Coverage   57.18%   56.58%   -0.60%     
==========================================
  Files          83       83              
  Lines        2966     2932      -34     
  Branches      540      540              
==========================================
- Hits         1696     1659      -37     
- Misses       1191     1197       +6     
+ Partials       79       76       -3     

Flag	Coverage Δ
unittests	56.58% <ø> (-0.57%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmrazor/models/distillers/base.py	36.92% <0.00%> (-5.34%)	⬇️
mmrazor/utils/setup_env.py	95.45% <0.00%> (-4.55%)	⬇️
mmrazor/models/mutables/mutable_module.py	75.00% <0.00%> (-3.05%)	⬇️
mmrazor/models/pruners/structure_pruning.py	86.14% <0.00%> (-2.25%)	⬇️
mmrazor/models/algorithms/base.py	61.61% <0.00%> (-1.13%)	⬇️
mmrazor/models/algorithms/autoslim.py	70.54% <0.00%> (-0.78%)	⬇️
mmrazor/models/mutators/one_shot_mutator.py	96.29% <0.00%> (-0.14%)	⬇️
mmrazor/models/mutators/differentiable_mutator.py	97.43% <0.00%> (-0.07%)	⬇️
mmrazor/core/hooks/search_subnet.py	0.00% <0.00%> (ø)
mmrazor/core/searcher/greedy_search.py	0.00% <0.00%> (ø)
... and 3 more

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