[Feature] Add CodeCornerRadius property to MarkdownTextBlock

[niels9001]

Describe the problem

At the moment, there's no easy way to set the CornerRadius of a CodeBlock in the MarkdownTextBlock.

Describe the solution

Introduce a new CodeCornerRadius resource (that inherites from ControlCornerRadius as the default).

This resource should be set to the ScrollViewer containing the code TextBlock:

WindowsCommunityToolkit/Microsoft.Toolkit.Uwp.UI.Controls.Markdown/Render/MarkdownRenderer.Blocks.cs

Line 397 in da6d7d3

Background = CodeBackground,

Alternatives

No response

Additional info

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