Get Thread History
Get all past states for a thread. Can return fewer than limit states; page with before to read further.
GET
Get Thread History
Query Parameters
Specify which fields of each state to return. Use values.<key> to return only that key of the state values, for example values.messages. If not provided, all fields are returned.
Available options:
values, next, tasks, checkpoint, metadata, created_at, parent_checkpoint, interrupts 
