[feature request] Polar axes in 2D

[asinghvi17]

I think this might be hard to implement, but polar axes would be really nice for some function visualizations.

[mkborregaard]

Isn't it just reinterpreting one of the axes as a radian?

[asinghvi17]

What I meant was making the axes themselves polar, like proj = :polar in Plots. It's easy to implement a conversion from Cartesian to polar for the coordinates themselves, but the axis styling is another matter. I'm not sure if it would work, but it'd go a long way to getting feature parity with Plots, and it is nice to have.

[asinghvi17]

so something like this (from Plots/GR examples):

with the circular grid and all...

[ffreyer]

Added in #2990