chore: create table copy/paste functionality

[scottdover]

Summary:
This introduces copy/paste for tables. A user is able to make a selection by clicking and dragging up or down, but not left to right. Additionally, there's no keyboard accessibility included as this time.

Scrolling left to right has been left out of this because of how column pinning works. If a user pins columns to the left, and drags to select, do we include those in the selection? Currently, we can't get them to scroll of page (otherwise, they aren't pinned). Additionally, if we have columns that are pinned to the right, there's not a good path forward of how those should be included in the selection. One thing worth exploring is unpinning columns just as we start to drag, and re-pinning after. One thing to look out for is if this causes a layout shift.

Keyboard accessibility is in the works. You can see some code in place for it. However, I've been unable to get it working without error. It would be my suggestion to get this in, and follow-up with a separate PR for including keyboard accessibility.

Testing:

• Make sure dragging selection works on table data, but doesn't negatively
  impact dragging columns around
• Make sure table selection includes data underneath selection rectangle,
  along with headers for that data
• Make sure pinned columns could be selected and that the resulting csv
  data is organized in order of how it's displayed in the table