chore: add license header (#35)

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

proto/greptime/v1/meta/route.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.meta;
@@ -11,7 +25,7 @@ service Router {
 
   // Fetch routing information for tables. The smallest unit is the complete
   // routing information(all regions) of a table.
-  // 
+  //
   // ```text
   // table_1
   //    table_name
@@ -50,7 +64,7 @@ message RouteRequest {
 message DeleteRequest {
   RequestHeader header = 1;
 
-  TableName table_name = 2; 
+  TableName table_name = 2;
 }
 
 message RouteResponse {
@@ -84,7 +98,7 @@ message Region {
   uint64 id = 1;
   string name = 2;
   Partition partition = 3;
-  
+
   map<string, string> attrs = 100;
 }
 
@@ -96,6 +110,6 @@ message Partition {
 
 // This message is only for saving into store.
 message TableRouteValue {
-  repeated Peer peers = 1; 
+  repeated Peer peers = 1;
   TableRoute table_route = 2;
 }