Add Contact Approval Callback

• Purpose:
  Processes new contact approval events.

• Functionality:
  Logs the details of the incoming contact request and automatically approves it by returning true.

• Usage:
  Automatically manages contact addition without requiring user interaction.

• Example:

  addContactApprovalCallback: async (model) => {
    console.debug(`Add contact approval:\n${JSON.stringify(model, null, 2)}`);
    return true;
  },