Add .NET 10 as a target platform

[Copilot]

• Update global.json to use .NET 10 SDK with rollForward to support both .NET 9 and 10
• Remove TargetFramework from common.props - set in each project instead
• Update generator project to target netstandard2.0 (Roslyn best practices)
• Update abstractions project to target net9.0;net10.0 (requires source interceptors)
• Update test project to multi-target net9.0;net10.0
• Update sample projects (ConsoleSample, ModularMonolithSample) to target net10.0
• Update benchmarks project to target net10.0
• Build and test to verify changes work correctly

Original prompt

Add .NET 10 as a target platform. It should support both .NET 9 and 10.

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[ejsmith]

@copilot Remove TargetFramework from the common.props and just set it in each project. The generator project should just target netstandard2.0 like the roslyn best practices say. The abstractions project should target both net9.0 and net10.0 as it requires source interceptors.

[Copilot]

@copilot Remove TargetFramework from the common.props and just set it in each project. The generator project should just target netstandard2.0 like the roslyn best practices say. The abstractions proj...

Done in c6ac565. The generator now targets netstandard2.0 per Roslyn best practices, and the abstractions project targets net9.0;net10.0 for source interceptors support. The TargetFramework setting has been moved from common.props to individual project files.