This commit adds a rule engine configuration option for changing the
implementation module used for the rule engine function jq. The two
options are `jq_port` (uses Erlang port programs to interact with jq)
and `jq_nif` (uses an Erlang NIF library to interact with jq).
Thanks to @terry-xiaoyu (Xinyu Liu <506895667@qq.com>) for Chinese
translations
prior to this change, the EMQX spellcheck dictionary
is baked into the docker image, which makes adding
new words to the dict more complicated long process:
you'd have to send a separate PR to the docker image
repo and tag a new docker image and update the dokcer
iamge tag in emqx.git
Kjell Winblad