feat: support tls-server-end-point channel binding for SCRAM-SHA-256 #1181
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Postgres supports "channel bindings" for SCRAM-SHA-256 authentication. This prevents certain MITM attacks. This authentication is known as "SCRAM-SHA-256-PLUS".
Postgres supports the "tls-server-end-point" channel binding form which is derived by hashing the raw bytes of the first certificate sent by the server in the TLS handshake.
Postgres also supports "requiring" channel binding. This additionally prevents a MITM sending cleartext the chosen authentication mechanism.
Related to #1145