ref: Overhaul console integration

Our console integration was designed to work on the same page with the Spotlight UI. It was using a naive filtering method to avoid infinite loops from Spotlight debug mode logger itself. Moreover, it was not taking the sidecarURL option, was defaulting to localhost:8969 as the sidecar URL. This patch overhauls the two, leveraging the fact that they are on the same page. This means switching to the local event-based message passing between the UI and the console integration, removing the need for fetch calls and passing around the sidecarURL option. It also overhauls the Spotlight logger to always try to use an unmodified console implementation, removing the need for hacky filtering on the console integration side.

ref #521.

getsentry / spotlight

ref: Overhaul console integration #525