Support for linechart would be nice

[sgmunn]

hi, I am a new user to Kusto Notebooks and one thing that's standing out to me is that there is no support for linechart and my experience so far with columnchart seems to indicate that it could use some of the following as well (or, quite possibly, I am missing something).

I use a lot of line charts but these don't render for me, and when I tried columnchart I had issues getting something rendered, particularly with series - the series labels were shown but I could not see the columns for them, nor any difference colors for each of the series. Timechart, for instance, appears to support this nicely.