Support row and column title for the accessibility node

The accessibility service, Talkback, wants to support more information
about the table on Chrome, but there’s no sources for it. We need to add
more data in the Accessibility node to make Talkback can do what it
wants.

This patch is adding the row and column title in the inner class,
CollectionItemInfo, of the AccessibilityNodeInfo class.

Bug: 181789503
Test: a11y CTS & unit tests
Change-Id: Id5d267836acf92b10a33a11677bd8f3ed040bfb9