[Feature] Support EMANet (#34)

* add emanet

* fixed bug and typos

* add emanet config

* fixed padding

* fixed identity

* rename

* rename

* add concat_input

* fallback to update last

* Fixed concat

* update EMANet

* Add tests

* remove self-implement norm

Co-authored-by: Jiarui XU <xvjiarui0826@gmail.com>