chore: add license header (#35)

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

proto/greptime/v1/meta/lock.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;
@@ -7,8 +21,9 @@ option go_package = "github.com/GreptimeTeam/greptime-proto/go/greptime/v1/meta"
 import "greptime/v1/meta/common.proto";
 
 service Lock {
-  // Lock acquires a distributed shared lock on a given named lock. On success, it
-  // will return a unique key that exists so long as the lock is held by the caller.
+  // Lock acquires a distributed shared lock on a given named lock. On success,
+  // it will return a unique key that exists so long as the lock is held by the
+  // caller.
   rpc Lock(LockRequest) returns (LockResponse);
 
   // Unlock takes a key returned by Lock and releases the hold on lock.
@@ -21,8 +36,8 @@ message LockRequest {
   // Name is the identifier for the distributed shared lock to be acquired.
   bytes name = 2;
 
-  // If the expiration time is exceeded and currently holds the lock, the lock is
-  // automatically released.
+  // If the expiration time is exceeded and currently holds the lock, the lock
+  // is automatically released.
   int64 expire_secs = 3;
 }
 
@@ -40,6 +55,4 @@ message UnlockRequest {
   bytes key = 2;
 }
 
-message UnlockResponse {
-  ResponseHeader header = 1;
-}
+message UnlockResponse { ResponseHeader header = 1; }