Add flowutils

pkg/flowutils/flowutils.go

@@ -0,0 +1,12 @@
+package flowutils
+
+func PanicIf(err error) {
+	if err != nil {
+		panic(err)
+	}
+}
+
+func Must[T any](val T, err error) T {
+	PanicIf(err)
+	return val
+}