Re-implement the `reactive` option in GoslingComponent props

[sehilyi]

This seems to be the most urgent option to include. It enables reactive updating of visualizations, which is essential when creating Gosling-based applications.

[sehilyi]

The reactive update of visualization happens by calling rerender():

gosling.js/src/tracks/gosling-track/gosling-track.ts

Line 427 in 0b32796

override rerender(newOptions: GoslingTrackOptions) {