Tellescope webhook endpoint that processes webhook events.

This endpoint:

1. Receives webhook data from Tellescope (requires Authorization API key header)
2. Extracts the user ID from the webhook payload
3. Finds or creates a thread based on tellescope_user_id
4. Triggers ReceivedTellescopeWebhookTrigger with the webhook data

Expected webhook payload should contain:

• tellescope_user_id: The Tellescope user ID
• event_type (optional): The type of event
  • Example: "user_created", "medication_shipped", "appointment_scheduled", "appointment_cancelled"
  • Each event should be set on the Tellescope step body as "event_type": "event",
• Additional data fields as needed:
  • Example: appointment_date, medication_name, medication_quantity, etc.
• Example webhook payload: { "tellescope_user_id": "123456", "event_type": "user_created", "appointment_date": "2026-01-15", "medication_name": "Medication A", "medication_quantity": 100 }