Kindsys: Add Ptr func (#61948)

pkg/kindsys/util.go

@@ -0,0 +1,24 @@
+package kindsys
+
+// Ptr returns a pointer to a value of an arbitrary type.
+//
+// This function is provided to compensate for Grafana's Go code generation that
+// represents optional fields using pointers.
+//
+// Pointers are the only technically [correct, non-ambiguous] way of
+// representing an optional field in Go's type system. However, Go does not
+// allow taking the address of certain primitive types inline. That is,
+// this is invalid Go code:
+//
+//	var str *string
+//	str = &"colorless green ideas sleep furiously"
+//
+// This func allows making such declarations in a single line:
+//
+//	var str *string
+//	str = kindsys.Ptr("colorless green ideas sleep furiously")
+//
+// [correct, non-ambiguous]: https://github.com/grafana/grok/issues/1
+func Ptr[T any](v T) *T {
+	return &v
+}