[Feature] Support KID

[LeoXing1996]

Feature:

• Support KID
• Support Metric to use the full dataset

TODO:

• Update activation to extracted inception state files
• Support download inception state files by URL (After merge [Feature] Support download inception state from url #233 )

[codecov]

Codecov Report

❌ Patch coverage is 62.06897% with 55 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.73%. Comparing base (46e2716) to head (ead647e).
⚠️ Report is 215 commits behind head on master.

Files with missing lines	Patch %	Lines
mmgen/core/evaluation/evaluation.py	0.00%	30 Missing ⚠️
mmgen/core/evaluation/metrics.py	78.26%	15 Missing and 10 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #234      +/-   ##
==========================================
+ Coverage   72.71%   76.73%   +4.02%     
==========================================
  Files         142      130      -12     
  Lines       10568     9530    -1038     
  Branches     2092     1922     -170     
==========================================
- Hits         7684     7313     -371     
+ Misses       2396     1744     -652     
+ Partials      488      473      -15     

Flag	Coverage Δ
unittests	76.73% <62.06%> (+4.02%)	⬆️

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