TapGestureRecognizer Secondary ButtonMask only sort of works for Android

### Description

I've checked in a spike to the following branch [android_secondary_click](https://github.com/dotnet/maui/commit/5a3c3b3386a0f345c46b31a27988d8d1ed0b3063).

The right click action when you have a mouse attached to a tablet by default just navigates back.

It's a bit awkward because the right click fires through `KeyEvents` so you just repurpose the `Back` keybutton that originates from a mouse as a "secondary" click.

You also have to wire up to the `Click` event. You don't have to actually do anything inside the click event but you have to add a `clicklistener` for all this to wire up

```C#
void SetupGestures()
{
if (View == null)
return;

var platformView = Control;
if (platformView == null)
return;

if (View.GestureRecognizers.Count == 0)
{
platformView.Touch -= OnPlatformViewTouched;
platformView.KeyPress -= OnPlatformViewKeyPressed;
}
else
{
platformView.Touch += OnPlatformViewTouched;
platformView.KeyPress += OnPlatformViewKeyPressed;

bool testMe = platformView.HasOnClickListeners;
platformView.Click += PlatformView_Click;
}
}

void PlatformView_Click(object? sender, EventArgs e)
{
}

void OnPlatformViewKeyPressed(object? sender, AView.KeyEventArgs e)
{
if (_disposed)
{
var platformView = Control;
if (platformView != null)
{
platformView.Touch -= OnPlatformViewTouched;
platformView.KeyPress -= OnPlatformViewKeyPressed;
}

return;
}

if ((e.Event?.Source & InputSourceType.Mouse) == InputSourceType.Mouse && e.KeyCode == Keycode.Back)
{
}
```

Review the android_secondary_click spike, especially SetupGestures, PlatformView_Click, and OnPlatformViewKeyPressed, to understand how Android mouse key events and click listeners reach TapGestureRecognizer. Reproduce a secondary-button click on an Android tablet with a mouse, then verify that it triggers the secondary gesture instead of navigating back without requiring an empty Click handler.

Written by the indexing model from the issue text.