We need to reverse the dependency of `emqx_bridge` and `emqx_bridge_*`, because the former
loads and starts bridges during its application startup. If the individual bridge
application being loaded has not started with its dependencies, the supervision tree will
not be ready for that.
There was an incorrect assumption that the data incoming to the IoTDB
bridge has already been parsed. This is fixed by parsing the payload as
JSON data if the payload is not already a map.
Fixes:
https://emqx.atlassian.net/browse/EMQX-9854
