New builtin JWT middleware - this one supports encryption and ed25519

Former-commit-id: ca20d256b766e3e8717e91de7a3f3b5f213af0bc

_examples/miscellaneous/jwt/private_rsa.pem

@@ -0,0 +1,30 @@
+-----BEGIN RSA PRIVATE KEY-----
+Proc-Type: 4,ENCRYPTED
+DEK-Info: DES-EDE3-CBC,6B0BC214C94124FE
+
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+-----END RSA PRIVATE KEY-----