For default tsl version and ciphers, we try to use otp release number
to determin if we want to use tlsv1.3
For default configs, we try to porivde both tlsv1.3 and
ciphers in config (even for commented out configs)
For compatibility with versions below 4.2, we still
use the `max_inflight_size` option, but generate it
as the `max_inflight`
Previous PR: https://github.com/emqx/emqx/pull/3938
* chore(conf): add quotation for hocon
* chore(conf): fix paths incompatible with hocon
* chore(conf): use hocon as parsing function
* chore(docker): add quotation to some env variables for hocon
* fix(bridge_mqtt): max_inflight_size -> max_inflight; this enables emqtt.erl to use the value
* chore(bridge_mqtt): fix elvis
* fix(worker): max_inflight_batches -> max_inflight
