Optimize the generic zero value (#27102)

allocate by declare,
this make it possible to allocate the value in stack,
faster and less presure for GC

Signed-off-by: yah01 <yah2er0ne@outlook.com>

pkg/util/generic/generic.go

@@ -19,7 +19,8 @@ package generic
 import "reflect"
 
 func Zero[T any]() T {
-	return *new(T)
+	var zero T
+	return zero
 }
 
 func IsZero[T any](v T) bool {