Option to add/remove data in visualization

When you have a bunch of dimensions + measures in your table, you should be able to remove/add them to the visualization (in case you don’t want all of them)

Two ways of doing this:

1. we put an 👁️ icon beside the names of the columns. If you click on the eye, it would add a / over the eye and remove it from the visualization. You can then click on the crossed-out eye to make it re-appear in the visualization.

2. We can add a gear symbol beside the name of the column. This could become the settings space for columns (e.g. you could say add filter or sort, etc. within this space eventually). If you click on the gear, there would be a drop-down menu that would let you select hide from chart (or show in chart)

[owlas]

@TuringLovesDeathMetal @ZeRego I think we can close this in favour of #413 ?

[TuringLovesDeathMetal]

closed in favour of #413