[Feature] Add ResNetV1c

[Ezra-Yu]

Motivation

Add ResNetV1c

Modification

Add ResNetV1c

Checklist

Before PR:

• Pre-commit or other linting tools are used to fix the potential lint issues.
• Bug fixes are fully covered by unit tests, the case that causes the bug should be added in the unit tests.
• The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• The documentation has been modified accordingly, like docstring or example tutorials.

After PR:

• If the modification has potential influence on downstream or other related projects, this PR should be tested with those projects, like MMDet or MMSeg.
• CLA has been signed and all committers have signed the CLA in this PR.

[codecov]

Codecov Report

Merging #692 (72e557b) into dev (43024cd) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##              dev     #692   +/-   ##
=======================================
  Coverage   85.03%   85.03%           
=======================================
  Files         121      121           
  Lines        7389     7393    +4     
  Branches     1277     1278    +1     
=======================================
+ Hits         6283     6287    +4     
  Misses        916      916           
  Partials      190      190           

Flag	Coverage Δ
unittests	85.03% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
mmcls/models/backbones/__init__.py	100.00% <100.00%> (ø)
mmcls/models/backbones/resnet.py	100.00% <100.00%> (ø)

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[mzr1996]

LGTM