fix(macos): add key modifiers to pointer event args

[ramezgerges]

GitHub Issue (If applicable): closes https://github.com/unoplatform/uno.hotdesign/issues/3010

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.
• Commits must be following the Conventional Commits specification.

Other information

Internal Issue (If applicable):

[ramezgerges]

For QA: the ListView_Selection_Pointers sample in SamplesApp shows ListViews in different selection modes. To validate this PR, you only need to look at the ListViews marked "single selection", "multiple selection", and "extended selection". These different selection modes work with Shift and Ctrl to be able to select a number of items at the same time. Try various combinations and compare with WinUI.

[unodevops]

🤖 Your Docs stage site is ready! Visit it here: https://unodocsprstaging.z13.web.core.windows.net/pr-18929/index.html

[spouliot]

👍

[unodevops]

🤖 Your WebAssembly Sample App stage site is ready! Visit it here: https://unowasmprstaging.z20.web.core.windows.net/pr-18929/index.html