Create interactive chat session

curl --request POST \
  --url https://api.case.dev/agent/v1/chat \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "title": "<string>",
  "model": "<string>",
  "idleTimeoutMs": 123
}
'

{
  "id": "<string>",
  "status": "<string>",
  "idleTimeoutMs": 123,
  "createdAt": "2023-11-07T05:31:56Z"
}