grpc: add caller info and wrap innerClient

Signed-off-by: okJiang <819421878@qq.com>

client/caller/constant.go

@@ -0,0 +1,44 @@
+// Copyright 2024 TiKV Project Authors.
+//
+// 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.
+
+package caller
+
+type (
+	ID        string
+	Component string
+)
+
+const (
+	// Unknown represents that don't know which component the caller is temporarily.
+	Unknown   ID = "unknown"
+	Tidb      ID = "tidb"
+	Pd        ID = "pd"
+	Tikv      ID = "tikv"
+	TiFlash   ID = "tiflash"
+	Lightning ID = "lightning"
+	Dumpling  ID = "dumpling"
+	Br        ID = "br"
+	Dm        ID = "dm"
+	Cdc       ID = "cdc"
+	Operator  ID = "operator"
+	Dashboard ID = "dashboard"
+
+	// If the component you used is not in the list, please add it here.
+	Ddl Component = "ddl"
+
+	// TestID is used for test.
+	TestID ID = "test"
+	// TestComponent is used for test.
+	TestComponent Component = "test"
+)