feat: ResetPassword endpoint

proto/zitadel/resources/user/v3alpha/user_service.proto

@@ -1540,6 +1540,16 @@ message RemoveUsernameRequest {
       example: "\"69629026806489455\"";
     }
   ];
+  // unique identifier of the username.
+  string username_id = 4 [
+    (validate.rules).string = {min_len: 1, max_len: 200},
+    (google.api.field_behavior) = REQUIRED,
+    (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {
+      min_length: 1,
+      max_length: 200,
+      example: "\"69629023906488334\"";
+    }
+  ];
 }
 
 message RemoveUsernameResponse {