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TableView: Adds keyboard and programmatic support for navigating through, selecting and resizing columns

A followup patch will add AXVirtualView objects for every row, column and table cell, and refine the accessibility actions further.
R=dmazzoni@chromium.org

Change-Id: I0d1d599ef8cc63f3965bbcbc5d01281912707e51
Bug: 101762
Reviewed-on: https://chromium-review.googlesource.com/c/1320974Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612885}