medium-extension v1.10.12

Uses code from https://github.com/checkly/headless-recorder Since this extension is injecting code into the user's browser, it is reduced to the bare minimum.

Selecting the extension button opens a popup with a play and stop button. Pressing play injects a capture content script into the current tab. The capture script sends browser events to a service that runs on port on the local computer. Pressing stop in the extension stops recording.