* Purpose: Allow the messages api endpoint to accept arbitrary JSON in it's body - and to respond with the latest task_data - this will allow you to create BPMN processes are that can function as microservices.
* Fixing a bug that prevented the synchronous execution of a message post.
* A message post directly uses the body of the post, do not specify it within a "payload".
* The message response is not just the process instance details, it now contains the "process_instance" and "task_data" at the top level of the returned json.
* The last completed task data is now returned as a part of a response to the message api endpoint, it is with the "task_data" attribute.
* CodeRabbit suggestions
* run_pyl fixes
* fix lint
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Co-authored-by: burnettk <burnettk@users.noreply.github.com>
