Store a user's chat conversations in persistent storage

[RobotSail]

Popular AI chat tools typically store the user's past conversation history so that they can continue the conversations in the future and share them when needed.

The InstructLab UI should have the ability for users' chats to be stored such that they can be continued at a later time.

For example, consider the following popular chat tool:

[Sunnidhya]

Please assign this issue to me; I am working on this

[RobotSail]

@Sunnidhya Thanks for taking on this issue. You'll want to look at #13 first as it's a pre-requisite to this one.

[vishnoianil]

@Sunnidhya Please feel free to ping me on Instructlab slack #ui channel if you need any help with this issues. Love to discuss any high level design that you have in mind for this integration.