[charts] Create a polar line chart

[alexfauquette]

radar with regular polar (degrees) coordinates would be great too, to show spatial distribution of fields, or sounds: https://images.app.goo.gl/de7p1LBNow6bWNKr6

Originally posted by @dberardo-com in #7925

From what I know, this kind of chart is exclusively used by scientist/technician.

On to plot series that have a periodic aspect, like death, temperature, precipitation, ... per day across multiple year

[dberardo-com]

Perhaps this comment is redundant, but I really do mean to use continuous values on the polar "axis" and not discrete ones. The example you report still shows 12 months, so discrete values.

In my example I have 360 degrees, so one could argue those are discrete values, but more in general those could be also continuous values