Add pkce and openidconnect storage

- Also refactor authorizationcode_test

Signed-off-by: Ryan Richard <rrichard@vmware.com>

test/library/iotest.go

@@ -33,6 +33,7 @@ func (l *testlogReader) Read(p []byte) (n int, err error) {
 	return
 }
 
+//nolint: gochecknoglobals
 var tokenLike = regexp.MustCompile(`(?mi)[a-zA-Z0-9._-]{30,}|[a-zA-Z0-9]{20,}`)
 
 func maskTokens(in []byte) string {