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* add layer scale

* add layer scale

* add layer scale

* Update mmcv/cnn/bricks/transformer.py
Co-authored-by: Zaida Zhou <58739961+zhouzaida@users.noreply.github.com>

* Update mmcv/cnn/bricks/transformer.py
Co-authored-by: Zaida Zhou <58739961+zhouzaida@users.noreply.github.com>

* add layer scale

* move LayerScale

* add layer_scale_init_value

* add typehint

* fix for tensor with any dim

* fix layer scale rule

* fix layer scale rule

* fix test

* add docs
Co-authored-by: Zaida Zhou <58739961+zhouzaida@users.noreply.github.com>

* first commit

* Add copyright pre-commit-hook

* add building bricks of cnn

* add unit tests

* use registry for building bricks

* minor updates

* add scale layer

* add test for scale

* add doc string
Co-authored-by: Jiarui XU <xvjiarui0826@gmail.com>