Add equivalent of `pandas`.`read_html`

[nfx]

trafficstars

To get more feature parity with Pandas, integrate with https://github.com/nfx/go-htmltable.

[tobgu]

Hi,

I don't think a dependency on a library such as go-htmltable will be built into qframe since I think the use case is a bit too specific and I would like to avoid more hard dependencies on external libraries than required.

I'm open for adding a convinence function or consuming some more neutral dataformat that can be produced from go-htmltable and turn it into a qframe.