[Update][Ease of Use] Generate IDs

[atroyn]

Generate IDs

Asking users to pass in IDs with their documents is another place where they can trip up. While this is a minor friction, eliminating this step will help get more users over the line.

[Complexity] Subtask

• [Low] Generate uuid if ids are not passed in by the user, and return these to the user on add .
• [Med] Have the Chunker generate IDs; it has to generate new IDs as chunks are created from docs.