What does this PR do?

Introduces a new community piece for Acuity Scheduling to automate appointment and client management.

Key Features:

• Actions: Create/Reschedule/Find Appointments, Create/Update/List Clients, Add Blocked Time.
• Triggers (Webhook-based): Appointment Scheduled, Appointment Canceled.
• Authentication: Basic Auth (User ID & API Key).

Fixes #7781 /claim #7781