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* Add slug field. Default is shortuuid
* Add User.public field.
* Remove UserProflie.public field.
* Remove id from UserSearchSerializer
* Rename UserPublicRetrieveSerializer to ShortUserPublicRetrieveSerializer
* Add LongUserPublicRetrieveSerializer
* Replace id with uuid on UserCreateSerializer, UserProjectRetrieveSerializer, UserApplyRetrieveSerializer, ShortUserPublicRetrieveSerializer
* Add PublicUserResourceViewSet