feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

backend/infra/contract/idgen/idgen.go

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2025 coze-dev 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 idgen
+
+import (
+	"context"
+)
+
+//go:generate mockgen -destination ../../../internal/mock/infra/contract/idgen/idgen_mock.go --package mock -source idgen.go
+type IDGenerator interface {
+	GenID(ctx context.Context) (int64, error)
+	GenMultiIDs(ctx context.Context, counts int) ([]int64, error) // suggest batch size <= 200
+}