feat(thrift): generic fastcodec (#1424)

internal/mocks/thrift/gen.sh

@@ -0,0 +1,5 @@
+#! /bin/bash
+
+kitex -module github.com/cloudwego/kitex  -gen-path .. ./test.thrift
+
+rm -rf ./mock # not in use, rm it

internal/mocks/thrift/k-consts.go

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2024 CloudWeGo 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 thrift
+
+// KitexUnusedProtection is used to prevent 'imported and not used' error.
+var KitexUnusedProtection = struct{}{}