Connect agents and plot datapoints

[blairlyons]

• [ ] https://github.com/simularium/simulariumio/issues/42
• [ ] simularium/simularium-planning#119
• [ ] https://github.com/simularium/simularium-planning/issues/59

Use case

As a user, I want to be able to tell which plot data refers to which agents, and vice versa.

Acceptance criteria

• A user can select datapoint(s) on a (relevant) plot and see which agent(s) in the 3D view are associated with those datapoint(s)
• A user can select agent(s) in the 3D view and see which datapoint(s) on each (relevant) plot are is associated with those agent(s)