Add support for visualizing reactive streams in a remote app

This would probably involve splitting rxvision into an "interceptor" module and a "visualizer" module, and adding a user-settable "transport" function/object to the visualizer.

Then, the user can implement whatever transport they need between the two, allowing you to visualize events in e.g. a Node.js app. The transport could default to just directly consuming from a local interceptor, in order to support the current use case.

The issue does not name files or tests. Start by mapping the existing rxvision interceptor and visualizer flow, then determine how a user-settable transport could connect them while preserving direct local consumption. Done means reactive-stream events can be visualized in a remote Node.js app and the current local use case still works.

Written by the indexing model from the issue text.