Create new conversation

curl --request POST \
  --url https://app.all-hands.dev/api/conversations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "repository": "<string>",
  "git_provider": "<string>",
  "selected_branch": "<string>",
  "initial_user_msg": "<string>",
  "conversation_instructions": "<string>",
  "image_urls": [
    "<string>"
  ],
  "replay_json": "<string>"
}'

{
  "status": "ok",
  "conversation_id": "<string>"
}