[API] Add Restricted Field to User (#14630)

* Expose Restricted field for User

* Add Option to Change Restricted on User via adminEditUser API

* Add test who change restricted & test if it changed it ...

* make generate-swagger

Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

modules/structs/user.go

@@ -30,6 +30,8 @@ type User struct {
 	LastLogin time.Time `json:"last_login,omitempty"`
 	// swagger:strfmt date-time
 	Created time.Time `json:"created,omitempty"`
+	// Is user restricted
+	Restricted bool `json:"restricted"`
 }
 
 // MarshalJSON implements the json.Marshaler interface for User, adding field(s) for backward compatibility