Rework message fetching

[TheHunterDog]

Currently the flow of the app is

• Updating chat
• Getting completion
• Setting Completed
• Updating chat

But when using a session_id this won't work. The completion returns an id which needs to be fetched using the completed. Right now the the completed is being used but the data is not.

To sum up, Update the flow to use a session_id, the session_id as far I am aware can be any random string that belongs to a session.

• Set a random guid as session_id with chathur_app as prefix
• Get the completion id
• Fetch the completion using completed