Include the ability to check if a user has installed the app or not in the All Participating App API.

To ensure efficient sharing, providers would like to confirm if the user has the sharing app installed on their device before initiating the content sharing process. For this purpose, TCB requires an unauthenticated API from the sharing app that can verify the installation status. This API will accept an encrypted phone hash and return a fixed response format, either {'installed': 'yes'} or {'installed': 'no'} with HTTP status code 200. This API endpoint will be available in All Partipating App API response.