TabView only supports closing tabs with a pointer device

Describe the bug It is not possible to close a TabViewItem using just the keyboard - likely ALLY issue.

Steps to reproduce the bug

1. In a blank app, add a TabView control.
2. Add some TabViewItems to the TabItems collection.
3. Add a handler for the TabCloseRequested event.
4. Set a break point in the event handler.

    <winui:TabView
        TabCloseRequested="OnTabCloseRequested">
        <winui:TabView.TabItems>
            <winui:TabViewItem Header="Item 1" />
            <winui:TabViewItem Header="Item 2" />
            <winui:TabViewItem Header="Item 3" />
        </winui:TabView.TabItems>
    </winui:TabView>

1. Run the app.
2. Try and close a tab without using a mouse, pen, finger, or other pointing device. i.e. just using keyboard (or a connected controller.)

Expected behavior The break point will never be hit! It should be possible to close a tab without having to use a pointing device. Without this it is not possible to provide a fully accessible experience using this control.

Screenshots button in question is highlighted in the screenshot below

Version Info

NuGet package version: Microsoft.UI.Xaml 2.2.190917002

Windows 10 version	Saw the problem?
Insider Build (xxxxx)
May 2019 Update (18362)	Yes
October 2018 Update (17763)
April 2018 Update (17134)
Fall Creators Update (16299)
Creators Update (15063)

Device form factor	Saw the problem?
Desktop	Yes>
Mobile
Xbox
Surface Hub
IoT

Additional context This issue was discovered as part of investigation into https://github.com/microsoft/WindowsTemplateStudio/issues/3407

[mrlacey]

By “mousewheel” we mean “middle click” (which is usually done by the mousewheel).

Yes, I was middle-clicking with the mousewheel but it did not realize the cursor has to be over the tab and this doesn’t work if the cursor is over the tab’s content.

I think just offering a default context menu seems best. That makes it more obvious for keyboard and gamepad users.

A default content item would be a good solution. Also having the Ctrl+F4 shortcut documented somewhere a user might possibly find it would also be good. I expect to see it as a tool-tip on on the close button.

[github-actions[bot]]

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