Make full request logs accessible via web UI

Easy access to full request logs via a web UI. The recorder attaches to the existing Rails.logger instance, and captures a copy of each log line into a per-thread buffer. When the request is over, the middleware makes the recorder store all the log lines that were recorded for that request as a compressed batch to an auto-expiring Redis key.Thus you no longer have to grep through log files or wrestle with logging pipelines to instantly see all the log lines relevant to a request you just made. This is ideal for when you're testing a feature in the wild with production-levels of data, which may reveal performance or other issues that you didn't catch in development.