Add tooltip with building name and ID on hover

[tomay]

This would apply to the points and footprints

See this example: https://github.com/CartoDB/carto.js/blob/develop/examples/TheHobbitLocations/js/app.js

Though that example relies on a callback from createVis, which we're not using here. So we'll have to feel our way though this using 8 year old docs and examples

[tomay]

One big issue, footprints do not have any attributes, apart from an id back to the building data (and this has a different name than it does on the building data)

So this is not going to be straightforward at all

[tomay]

Okay, I've got a roll-your-own tooltip in place:

@danrademacher any thoughts on style or layout? The ID in particular, I'm not sure what treatment makes sense for that. For now it's just pasted in as

`${name}, ${id}`

This is up on staging: https://greeninfo-network.github.io/seattle-building-dashboard/

[tomay]

Inspired by the map popup, I went ahead and gave the tooltip look a similar treatment for Name and ID:

Feel free to reopen if this needs anything else

[danrademacher]

looks excellent!