[EPIC] Javascript enhancements

[emmalu]

Context

Interactive maps need to be reactive in any and all environments.

Issue

Let's implement some JS-based improvements.

Acceptance-Criteria

These are the tasks that need to be completed or artifacts that need to be produced.

• Select data by bounding box #148
• Responsive Maps #264
• Sync view state between Python and JS #112

[kylebarron]

#148 is probably the most powerful feature here and is what I'd focus on, even though it has a bit of a learning curve, in particular to figure out how to draw the bounding box.

#264 is a bit of an unknown. I don't really know what the necessary parts of it are.

#112 was prototyped in #113 but it looks like it might have too much overhead and performance impact, at least in the way I was testing.