Issue 3819 - pass message_id to _rasa_http_parse

[EdouM]

Proposed changes:

• Pass "message_id" to _rasa_http_parse method in RasaNLUHttpInterpreter
• fixes Message_id not passed in _rasa_http_parse in RasaNLUHttpInterpreter #3819

Status (please check what you already did):

• made PR ready for code review
• added some tests for the functionality (updated the current test actually)
• updated the documentation
• updated the changelog
• reformat files using black (please check Readme for instructions)

[CLAassistant]

All committers have signed the CLA.

[akelad]

Thanks for submitting this PR, we'll give it a review as soon as possible

[tabergma]

@EdouM Implementation looks good. Just a quick question: Does it also make sense to add it the /model/parse endpoint of Rasa (see https://github.com/RasaHQ/rasa/blob/master/rasa/server.py#L802)?

[EdouM]

@tabergma indeed it makes sense to add message_id to the /model/parse endpoint. I committed the change, let me know if anything else is needed!

[tabergma]

Looks great so far, but you need to add two more things:
First, please update the API specs: https://github.com/RasaHQ/rasa/blob/master/docs/_static/spec/rasa.yml#L530
Second, you need to pass on the message_id here: https://github.com/RasaHQ/rasa/blob/master/rasa/core/interpreter.py#L258

[EdouM]

@tabergma thanks for the suggestions, I just reviewed and pushed them. Sorry for the back and forth I should have realized this on my own but I appreciate the feedback.

[tabergma]

Great! Thanks a lot for adding the remaining things 🚀 Will merge once the tests pass.