Implement color fallback to DataVizPalette

[krkshitij]

Following issues have been identified/reported:

1. Most charts still use color fallbacks to a small set of colors from the default palette, rather than the newly introduced DataVizPalette.

2. The current implementation lacks a mapping between the legends and the fallback colors used. Consequently, during each state update, data points associated with the same legend may be assigned different colors randomly.