Added threadId to Feedback

[mayaankvad]

Added threadId to Feedback. This will allow for getting the associated threadId easily. Plan to use this in adding document database data layers to chainlit like Dynamo. Discussed with @willydouhard

[willydouhard]

I think this is great! This does not update the data layers but this is probably out of scope. I assume you are using a custom data layer yourself?

[mayaankvad]

Yes I wanted to keep this PR small. The literal and sql data layers also don't need to use the threadId property so there was no reason to update them. I can make another PR to add those properties to the sql layer (but that might require everyone using it to update their table schema on chainlit upgrade), let me know if this is something you want me to look into.

I am working on a custom data layer that needs the threadId, so I wanted to add this change in preparation for that PR.