1. add new registry api under resources.kubesphere.io/v1alpha3
2. deprecate registry api v1alpha2
Registry API v1alpha2 uses docker client to authenticate image registry
secret, which depends on docker.sock. We used to mount host
`/var/run/docker.sock` to deployment. It will prevent us imgrating to
containerd since no `docker.sock` exists. Registry API v1alpha3 comes to
rescure, it wraps library go-containerregistry and compatible with
docker registry, Harbor etc.
1. Remove ks-iam standalone binary, move it to ks-apiserver
2. Generate all devops apis inside kubesphere repository, no need to
import s2ioperator.
3. Reorganize ldap code, make it more flexible to use.
