perf: router workers and optimizations

[DanielSchiavini]

• Fixes Curvejs Performance: (Router swap) #312
• Runs the router graph creation and route finding algorithms in web workers, for UI responsivity
• This should be backwards compatible for any clients. It runs synchronously in nodejs.
• Route graph algorithm is not changed, just moved (a few changes were done to avoid list spread syntax, tsc uses helpers for that that do not work in a web worker)
• Route finding algorithm is optimized to preemptively stop routes when they are not possibly the best choices based on minTvl and route length.
  • Route finding is roughly 3x faster (worst case, no match) up to 300x faster (best case, direct match) - check yourself if you wish with commit 892ec4e

[DanielSchiavini]

Note in the following profile how the arced part of the code is now being ran in a worker, so it doesn't block the UI thread anymore.

The route graph construction still happens in the UI thread for now, as we need the global curvejs state.

[DanielSchiavini]

The new algorithm was first isolated in #386 so it might be easier to review there. In that PR the code was 3x faster, but commit bad8491 made the best case dramatically more efficient

[DanielSchiavini]

This makes the worker code output a bit better - I think es6 is already well supported anyway

[DanielSchiavini]

Screencast.from.26-08-24.09.33.15.webm