Adjust `DisplayInformation` and scale handling for Uno.WinUI

[ramezgerges]

Current behavior

We create a single DisplayInformation singleton to use with all ApplicationViews. This means that if we have 2 windows on 2 separate displays, they will return the same DPI details.

Expected behavior

Create a new DisplayInformation for each ApplicationView.

How to reproduce it (as minimally and precisely as possible)

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Workaround

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Works on UWP/WinUI

None

Environment

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NuGet package version(s)

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Affected platforms

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IDE

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IDE version

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Relevant plugins

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Anything else we need to know?

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