feat(skia): Support RTL FlowDirection

[Youssef1313]

GitHub Issue (If applicable): Skia part of #21

PR Type

What kind of change does this PR introduce?

What is the current behavior?

What is the new behavior?

Copilot Summary

🤖 Generated by Copilot at 4cb7cb6

This pull request adds support for right-to-left (RTL) layout and text rendering to the Uno platform, especially for the Skia target. It introduces a new FlowDirection property to the FrameworkElement class and its subclasses, and applies a transformation matrix to the Visual of the elements based on their flow direction. It also updates the TextBlock and TextBox classes to handle RTL text alignment and input. It modifies several files in the src/Uno.UI and src/SamplesApp folders, and adds a new compilation symbol, SUPPORTS_RTL, to the project file.

PR Checklist

Please check if your PR fulfills the following requirements:

• Docs have been added/updated which fit documentation template (for bug fixes / features)
• Unit Tests and/or UI Tests for the changes have been added (for bug fixes / features) (if applicable)
• Validated PR Screenshots Compare Test Run results.
• Contains NO breaking changes
• Associated with an issue (GitHub or internal) and uses the automatic close keywords.
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Other information

Internal Issue (If applicable):

[MartinZikmund]

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