feat(a11y): Add optional home/end key support to ListKeyManager

[vanessanschmitt]

For some components like menus and listboxes, WAI a11y recommends
that pressing home or end should focus the first or last element
respectively. Add support for home/end to ListKeyManager.

[jelbourn]

Thoughts on making this the default behavior? I'm actually surprised that we didn't do this already.

[crisbeto]

We used to have this inside the ListKeyManager, but we slowly transitioned to doing it on a case-by-case basis, because there are some places where home/end already do something. E.g. in an input they were conflicting with the native behavior that moves the caret to the start/end.

[vanessanschmitt]

Thanks for the context, @crisbeto! That makes sense why we wouldn't want this to be the default behavior. I'm migrating a bunch of my team's components to use the cdk KeyManager classes, and one of my main justifications is "Look how many lines of custom code I removed!" haha. A lot of them have duplicate Home/End key logic, so I'd love to be able to remove that too by making this an option in ListKeyManager...

[jelbourn]

LGTM

[jelbourn]

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