feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

backend/pkg/lang/sets/sets.go

@@ -0,0 +1,42 @@
+/*
+ * 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 sets
+
+type Set[T comparable] map[T]struct{}
+
+func FromSlice[T comparable](s []T) Set[T] {
+	set := make(Set[T], len(s))
+	for _, elem := range s {
+		cpElem := elem
+		set[cpElem] = struct{}{}
+	}
+	return set
+}
+
+func (s Set[T]) ToSlice() []T {
+	sl := make([]T, 0, len(s))
+	for elem := range s {
+		cpElem := elem
+		sl = append(sl, cpElem)
+	}
+	return sl
+}
+
+func (s Set[T]) Contains(elem T) bool {
+	_, ok := s[elem]
+	return ok
+}