In track selection list, click&drag should (de)select all visited tracks.

In the track selection list, you need to click on each track you want to show/hide, with some special handling of main thread tracks.

It would be nice if it was possible to click and then drag, in order to select or deselect a bunch of tracks.
If the cursor is initially on a hidden track, it should become visible, and then all hovered tracks should also be made visible (if not yet).
And conversely, starting from a visible track should deselect it, and deselect further hovered tracks.

┆Issue is synchronized with this [Jira Task](https://mozilla-hub.atlassian.net/browse/FP-497)