Remove rasa chat

[m-vdb]

Relates to https://github.com/RasaHQ/rasa-plus/pull/846

Proposed changes:

• Create a new channel in rasa-plus that extends socketio (e.g. SocketioPro or something like that); this channel is internal for now, no need to add it to built-in channels or to document it. It only extends the blueprint function to add the /chat endpoint – copy the code from OSS there;
• Move the chat CLI command from OSS repo to rasa-plus repo; update the implementation of the refine_cli hook;
• Move the /flows endpoint away from the server.py; we will probably need to create a hook for this to work;
• Update pyproject.toml on OSS to remove this line and on rasa-plus to add it; it makes sure that chat.html is packaged when released;

Status (please check what you already did):

• added some tests for the functionality
• updated the documentation
• updated the changelog (please check changelog for instructions)
• reformat files using black (please check Readme for instructions)

[tmbo]

lgtm 👍

[m-vdb]

@tmbo it looks like we both overlooked the obvious... f9f54bb

[tmbo]

lol 😂

[sonarqubecloud]

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