Add moment charts.

[na9da]

Implements the following:

• Moment lines chart
• Moment points chart

[na9da]

Zoom performance is very poor at this point for large datasets (> 300 points). This is a known problem for victory charts. Victory docs suggests implementing domain clipping and downsampling as solutions to manage this problem.

The downsampling algo given in the docs does not faithfully preserve the shape of the original full-data chart. LTTB algo looks like a better alternative.

One problem still remains even after implementing LTTB. Zooming will result in the chart line fluctuating a bit because of choosing slightly different points at different zoom levels.

TODOs:

• Domain clipping
  - [ ] LTTB Downsampling

[na9da]

Have improved performance by passing pre-formatted data to victory. So not implementing downsampling for now.