This commit fixes the upgrade and downgrade strategy when upgrading
from a bridge V1 to connector and action or the other way around so that
the custom callbacks get the complete unchanged input instead of the
result of the automatic translation. The automatic translation is used
if the callback is not defined.
This allows a n:1 relation between v1 bridge_types to action/connector types as
it's the case with mongodb for instance, where we had `mongodb_single`
`mongodb_sharded` etc and the new implementation will just have `mongodb`.
This commit adds callbacks to the emqx_action_info module for
doing fixes (such as changing a field name) after the automatic
split of a Bridge V1 config or the merge of connector and action
configs for the compatibility layer.
Kjell Winblad