Get a thread by its ID.
Returns 404 if the thread does not exist or does not belong to the authenticated user.
Successful Response
Thread entity model
Status values: idle, busy, interrupted, error
Unique identifier for the thread.
Identifier of the user who owns this thread.
Timestamp when the thread was created.
Timestamp when the thread was last updated.
Current thread status: idle, busy, interrupted, or error.
Arbitrary metadata attached to the thread.