Add extra dependencies to extra_require

[zhouzaida]

Thanks for your contribution and we appreciate it a lot. The following instructions would make your pull request more healthy and more easily get feedback. If you do not understand some items, don't worry, just make the pull request and seek help from maintainers.

Motivation

Add extra dependencies to extra_require.

Modification

• Add requirements.txt.
• Update setup.py.

BC-breaking (Optional)

No

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here, and update the documentation.

Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects, like MMDet or MMCls.
4. The documentation has been modified accordingly, like docstring or example tutorials.

[codecov]

Codecov Report

Merging #133 (3de8b9c) into main (77f5866) will not change coverage.
The diff coverage is n/a.

❗ Current head 3de8b9c differs from pull request most recent head 0738c33. Consider uploading reports for the commit 0738c33 to get more accurate results

@@           Coverage Diff           @@
##             main     #133   +/-   ##
=======================================
  Coverage   32.77%   32.77%           
=======================================
  Files          22       22           
  Lines        1620     1620           
  Branches      371      371           
=======================================
  Hits          531      531           
  Misses       1045     1045           
  Partials       44       44           

Flag	Coverage Δ
unittests	32.77% <ø> (ø)

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[ice-tong]

LGTM