feat(ldap): Add LDAP

* rename: Admin to AdminGroup

* update

* cleanup

* tmp save group mapping

* add enableControl(not-test)

* verify username exist before create(for LDAP)

* add getAllGroupsDn()

* rename

* adminGroup

* enable TLS Verify

* init for ldap

---------

Co-authored-by: Tao Chen <iamtaochen@outlook.com>

config/config.go

@@ -38,6 +38,7 @@ type Config struct {
 	Jwt      Jwt
 	Rustdesk Rustdesk
 	Proxy    Proxy
+	Ldap	 Ldap
 }
 
 // Init 初始化配置