Fuzzing: Add 3 fuzzers

Signed-off-by: AdamKorcz <adam@adalogics.com>

reference/fuzz.go

@@ -0,0 +1,12 @@
+// +build gofuzz
+
+package reference
+
+// fuzzParseNormalizedNamed implements a fuzzer
+// that targets ParseNormalizedNamed
+// Export before building the fuzzer.
+// nolint:deadcode
+func fuzzParseNormalizedNamed(data []byte) int {
+	_, _ = ParseNormalizedNamed(string(data))
+	return 1
+}