4.1.1

• Ported changes from EMQX's fork (based on 2.3.6) back to master branch
  • Included an pushback twards 'no_ack' callers. emqx#1
• Avoid crashing on decoding unknown error codes.
  e.g. when newer version Kafka introduced new error codes
  kpro_schema may not have it yet.
• Improve SNI (server_name_indication) config.
  • Prior to this change, SNI is auto-added only when SSL option
    'verify' is set to 'verify_peer'.
    This retriction is unnecessary, because SNI is a part of
    client-hello in the handshake, it does not have anything to do
    with server certificate (and hostname) verification.
  • The connection config is shared between bootstrap connection
    and partition leader connection.
    Using a static SNI may work for bootstrap connections but
    may then fail for partition leaders if they happen to be
    different hosts (which is always the case in confluent cloud).
    To fix it, we now allow users to use two special values for SNI:
    • auto: use the exact connecting host name (FQDN or IP)
    • none: do not use anything at all.