Function create_postgres_tls_connector 

pub fn create_postgres_tls_connector(
    tls_config: &TlsOption,
) -> Result<MakeRustlsConnect>

Creates a PostgreSQL TLS connector based on the provided configuration.

This function creates a rustls-based TLS connector for PostgreSQL connections, following PostgreSQL’s TLS mode specifications exactly:

TLS Modes (PostgreSQL Specification)

• Disable: No TLS connection attempted
• Prefer: Try TLS first, fallback to plaintext if TLS fails (handled by connection logic)
• Require: Only TLS connections, but NO certificate verification (accept any cert)
• VerifyCa: TLS + verify certificate is signed by trusted CA (no hostname verification)
• VerifyFull: TLS + verify CA + verify hostname matches certificate SAN