test: Add the embedded aliases file to the fuzz corpus

This patch adds the embedded aliases file to the fuzz corpus, because it
is trivial to do so, and is a reasonable seed which will be naturally
adjusted over time as the package evolves (as it happened in recent
commits).

internal/aliases/aliases_test.go

@@ -606,6 +606,7 @@ func FuzzReader(f *testing.F) {
 	resolver.AddDomain("domain")
 	resolver.DropChars = "."
 	resolver.SuffixSep = "-+"
+	f.Add([]byte(richFileContents))
 	f.Fuzz(func(t *testing.T, data []byte) {
 		resolver.parseReader("domain", bytes.NewReader(data))
 	})