Quicker Echarts by "Polarizing" more expressions

[abstractqqq]

I noticed there are lots of inefficient handling of data using Python right now, despite having Polars's expressions that can handle the operations, e.g.

max(dt1[YVar].max(), dt1[XVar].max(), dt1[ZVar].max())

dt.with_columns(pl.col(YVar).map_elements(math.sqrt))

which can be replaced by native Polars expressions. I am opening this issue so that (1) I will remind myself to make a PR and change as much as possible, and (2) We can start by writing more Polars expressions instead of Python in future features

[AdrianAntico]

This sounds great!