Randomization audit trail

[kamilsi]

To enhance the transparency and accountability of our API we need a new endpoint: GET /study/{study_id}/audit_trial. This endpoint will provide a detailed audit trail for a specific study, including a summary of all requests made for given study, along with their timestamps and the system's replies. Implementing this feature requires the development of a mechanism to capture, log, and retrieve all pertinent request and response data for audit purposes.