[blocked] Use routes to split up js dist files

[kfarr]

After 3DStreet/3dstreet-editor#245 we learned that even after tree shaking the bundle size for 3dstreet-editor is 1.2MB. This is a lot to load at one time

Instead, break up the js to load just the specific components that might be necessary for a particular operation.

Rosty had done this before using routing, it might be time to revisit that

[kfarr]

this is blocked by @kfarr lack of progress in helping to outline next steps esp. wrt server-side cloud function routing