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Implements the ITableProvider and ITableItemProvider for UIA.
Currently just supports TableView's column headers. Row headers
are not supported in TableView's control.

AX-Relnotes: Column Headers in TableView are announceable.
Bug: 1078623
Change-Id: I7c8ba49cd8de9fffe471e91c4d6d4e759c9ddc29
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2348541
Commit-Queue: Mohamed Mansour <mmansour@microsoft.com>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799200}