feat: trust ping api

Description

Sending trust ping is async flow that uses web hook to return the end result. To send ping to a mobile app hit the endpoint, if the mobile app is opened in the moment it will immediately retrun, the response will be sent to the trust ping sender via web hook.

Related issues

Testing

Checklist

• I have updated the documentation (if necessary)
• I have added unit tests for new functionality (if applicable)
• My code follows the style guidelines of this project
• I have tested this code on my local machine before submitting this MR

Reviewers

@boyan.tsolov @alexey.lunin

Additional Notes

No way to test this, as we dont have handler for the web hook.

Closes #84 (closed)