Data Grid accessibility issues

[jrthompson33]

There are two lingering accessibility issues with the Data Grid:

• Each data point is announced as a clickable element. Is there any eventual functionality we would implement when we click a point? else this may appear confusing to a screen reader user.
• there is an empty clickable element next to each column header.

Both require customizing the rendering of the Data Grid

[venkateshpotluri]

I will add scenarios that talk about the interactivity we might want to have before we customize the grid as they may effect the type of customizations we may have to do on this. Assigning @venkateshpotluri as adding scenarios seems to be a dependency for this. I will assign this back to @jrthompson33 once the dependency on me is resolved.