feat(skia): (partially) implement ShapeVisual.ViewBox and fix ShapeVisual clipping

[ramezgerges]

GitHub Issue (If applicable): closes #18528

PR Type

What kind of change does this PR introduce?

What is the current behavior?

What is the new behavior?

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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Internal Issue (If applicable):

[unodevops]

🤖 Your Docs stage site is ready! Visit it here: https://unodocsprstaging.z13.web.core.windows.net/pr-18561/index.html

[unodevops]

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[unodevops]

🤖 Your Docs stage site is ready! Visit it here: https://unodocsprstaging.z13.web.core.windows.net/pr-18561/index.html

[unodevops]

🤖 Your WebAssembly Sample App stage site is ready! Visit it here: https://unowasmprstaging.z20.web.core.windows.net/pr-18561/index.html

[unodevops]

🤖 Your Docs stage site is ready! Visit it here: https://unodocsprstaging.z13.web.core.windows.net/pr-18561/index.html

[unodevops]

🤖 Your WebAssembly Sample App stage site is ready! Visit it here: https://unowasmprstaging.z20.web.core.windows.net/pr-18561/index.html

[jeromelaban]

@ramezgerges this test looks odd:
https://dev.azure.com/uno-platform/Uno%20Platform/_build/results?buildId=145111&view=ms.vss-test-web.build-test-results-tab&runId=3116491&resultId=101728&paneView=attachments

[ramezgerges]

@jeromelaban It's just the flakiness of screenshot tests with images. I've checked locally and it's working fine.