[Enhancement] colorization inferencer

[liuwenran]

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Motivation

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Modification

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BC-breaking (Optional)

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Use cases (Optional)

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Checklist

Before PR:

• I have read and followed the workflow indicated in the CONTRIBUTING.md to create this PR.
• Pre-commit or linting tools indicated in CONTRIBUTING.md are used to fix the potential lint issues.
• Bug fixes are covered by unit tests, the case that causes the bug should be added in the unit tests.
• New functionalities are covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• The documentation has been modified accordingly, including docstring or example tutorials.

After PR:

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

[codecov]

Codecov Report

Base: 88.96% // Head: 88.98% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (3f2f062) compared to base (04a872e).
Patch coverage: 78.04% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #1588      +/-   ##
===========================================
+ Coverage    88.96%   88.98%   +0.01%     
===========================================
  Files          399      400       +1     
  Lines        26031    26072      +41     
  Branches      4038     4043       +5     
===========================================
+ Hits         23158    23199      +41     
+ Misses        1976     1974       -2     
- Partials       897      899       +2     

Flag	Coverage Δ
unittests	88.98% <78.04%> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
mmedit/edit.py	91.76% <ø> (ø)
mmedit/apis/inferencers/colorization_inferencer.py	76.31% <76.31%> (ø)
mmedit/apis/inferencers/mmedit_inferencer.py	90.90% <100.00%> (+0.66%)	⬆️
mmedit/datasets/transforms/aug_shape.py	96.12% <0.00%> (+0.64%)	⬆️
...els/editors/inst_colorization/inst_colorization.py	38.46% <0.00%> (+12.30%)	⬆️

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