line-break check was failing before:
```
Run ./scripts/check-nl-at-eof.sh
./scripts/check-nl-at-eof.sh
shell: sh -e {0}
fatal: unsafe repository ('/__w/emqx/emqx' is owned by someone else)
To add an exception for this directory, call:
git config --global --add safe.directory /__w/emqx/emqx
```
This commit adds a function to the rule engine that alows users
to transform text or JSON objects using [jq filter programs][1].
[jq][1] is a command line tool that can be used to transform
and filter JSON text using jq's built-in language. The rule engine
function that is added with this commit uses the
[Erlang jq NIF library][2] that wraps the jq C library in an
Erlang NIF function.
[1]: https://stedolan.github.io/jq/
[2]: https://github.com/emqx/jq
firest