[Feature] Support entry point

[nijkah]

Now you can run mmtune with CLI.

example

python3 -m mmtune configs/mmtune/mmcls_cifar_100_asynchb_nevergrad_pso.py configs/mmcls/resnet/resnet50_8xb16_cifar100.py

Code pattern for entry-point is borrowed from https://github.com/pytest-dev/pytest/blob/main/src/pytest/__main__.py.

[yhna940]

LGTM

[nijkah]

I'll check other patterns such as https://github.com/pypa/virtualenv/blob/main/src/virtualenv/__main__.py.

[github-actions]

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mmtune/main.py

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mmtune/run.py

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