feat: add hover popup to centroids and project features

[steveoh]

refs #16

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[stdavis]

This looks great. I like the idea of using the DOM api's for moving the tooltip around rather than rerendering the component.

I also had the thought today that perhaps a hover popup could be configured as part of the feature service? Or maybe that's just an AGOL thing. Either way, I think that this solution is great.

[steveoh]

I also had the thought today that perhaps a hover popup could be configured as part of the feature service.

I wasn't able to find this. Is this a thing?

[stdavis]

I wasn't able to find this. Is this a thing?

I'm not sure. Maybe it's an AGOL thing, not stand-alone server.