chore: add license header (#35)

Signed-off-by: Ruihang Xia <waynestxia@gmail.com>

proto/greptime/v1/database.proto

@@ -1,3 +1,17 @@
+// Copyright 2023 Greptime Team
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 syntax = "proto3";
 
 package greptime.v1;
@@ -29,9 +43,7 @@ message GreptimeRequest {
 
 message GreptimeResponse {
   ResponseHeader header = 1;
-  oneof response {
-    AffectedRows affected_rows = 2;
-  }
+  oneof response { AffectedRows affected_rows = 2; }
 }
 
 message QueryRequest {
@@ -58,7 +70,8 @@ message InsertRequest {
 }
 
 message DeleteRequest {
-  // The table name to delete from. Catalog name and schema name are in the `RequestHeader`.
+  // The table name to delete from. Catalog name and schema name are in the
+  // `RequestHeader`.
   string table_name = 1;
 
   // The region number of current delete request.