Refactor Contains function to improve performance by using index iter…

…ation over collection (#428)

Co-authored-by: 关明 <guanming@ziipin.com>

intersect.go

@@ -2,8 +2,8 @@ package lo
 
 // Contains returns true if an element is present in a collection.
 func Contains[T comparable](collection []T, element T) bool {
-	for _, item := range collection {
-		if item == element {
+	for i := range collection {
+		if collection[i] == element {
 			return true
 		}
 	}