Add support local variables to message json body #55
Description
Hello. I had a need to run events, with the transfer of local variables, so that they were not visible on the main process.
There is such an opportunity in the documentation, I checked it with a postman, everything also works. I wanted to expand api through PR, but no returns 403 ((
link to documentation: https://docs.camunda.org/manual/7.11/reference/rest/message/post-message/
