feat: macOS ICU build

[ramezgerges]

GitHub Issue (If applicable): #

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:

• Tested code with current supported SDKs
• 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)
• Wasm UI Tests are not showing unexpected any differences. Validate PR Screenshots Compare Test Run results.
• Contains NO breaking changes
• Updated the Release Notes
• Associated with an issue (GitHub or internal)

Other information

Internal Issue (If applicable):

[Copilot]

Pull Request Overview

This PR adds macOS support to the Uno ICU library by creating a new uno.icu-macos NuGet package and updating the build process to compile ICU libraries for macOS platforms.

• Adds build jobs for creating universal macOS ICU binaries (x86_64 and arm64)
• Creates new uno.icu-macos NuGet package specification for macOS ICU libraries
• Restructures the existing build process to support multiple target platforms

Reviewed Changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
.github/workflows/main.yml	Adds macOS build jobs and restructures artifact handling to support both WASM and macOS targets
nuget/uno.icu-macos/uno.icu-macos.nuspec	Creates NuGet package specification for macOS ICU libraries
nuget/uno.icu-wasm/buildTransitive/Uno.icu-wasm.targets	Adds MSBuild targets for WASM native file references
nuget/uno.icu-wasm/build/Uno.icu-wasm.targets	Removes WebAssembly-specific condition from embedded resource inclusion
nuget/buildTransitive/Uno.icu-wasm.targets	Removes old build targets file (moved to package-specific location)

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[Copilot]

The project URL references 'uno.icu-wasm' but this is a macOS package. The URL should reflect the correct repository name or be updated to a more generic URL that covers both platforms.

Suggested change

	<projectUrl>https://github.com/unoplatform/uno.icu-wasm</projectUrl>
	<projectUrl>https://github.com/unoplatform/uno.icu</projectUrl>

[Copilot]

The description mentions 'WebAssembly' but this package is for macOS. It should be updated to 'The International Components for Unicode for macOS' or a more generic description.

Suggested change

	<description>The International Components for Unicode for WebAssembly</description>
	<description>The International Components for Unicode for macOS</description>

[Copilot]

The repository URL references 'Uno.icu-wasm.git' but this is a macOS package. The URL should be updated to reflect the correct repository name or use a more generic repository URL.

Suggested change

	<repository type="git" url="https://github.com/unoplatform/Uno.icu-wasm.git" />
	<repository type="git" url="https://github.com/unoplatform/uno.icu.git" />

[jeromelaban]

aside from copilot's comments, looks good