Function verify_server_name 

pub fn verify_server_name(
    cert: &ParsedCertificate<'_>,
    server_name: &ServerName,
) -> Result<(), Error>

Verify that the end_entity has a name or alternative name matching the server_name note: this only verifies the name and should be used in conjuction with more verification like verify_server_cert_signed_by_trust_anchor