[AppKit] Add a weakly typed version of NSRulerView.WeakMeasurementUnits. Fixes #17742.

[rolfbjarne]

There's not a finite list if measurement units, apps can create their own, so
we have to allow weakly typed measurement units (the normal property is bound
using a strong enum to NSRulerViewUnits).

Fixes #17742.

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• macOS: vsdrops gist (No breaking changes)

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• tvOS: (empty diff detected)
• MacCatalyst: (empty diff detected)
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✅ API diff vs stable

Legacy Xamarin (No breaking changes)

• iOS: vsdrops gist (No breaking changes)
• tvOS: vsdrops gist (No breaking changes)
• watchOS: vsdrops gist (No breaking changes)
• macOS: vsdrops gist (No breaking changes)

.NET (No breaking changes)

• iOS: vsdrops gist (No breaking changes)
• tvOS: vsdrops gist (No breaking changes)
• MacCatalyst: vsdrops gist (No breaking changes)
• macOS: vsdrops gist (No breaking changes)
• Microsoft.iOS vs Microsoft.MacCatalyst: vsdrops gist

Legacy Xamarin (stable) vs .NET

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• Microsoft.iOS.Bundle.16.2.291-ci.pr.gh17779.pkg
• Microsoft.iOS.Ref.16.2.291-ci.pr.gh17779.nupkg
• Microsoft.iOS.Runtime.ios-arm.16.2.291-ci.pr.gh17779.nupkg
• Microsoft.iOS.Runtime.ios-arm64.16.2.291-ci.pr.gh17779.nupkg
• Microsoft.iOS.Runtime.iossimulator-arm64.16.2.291-ci.pr.gh17779.nupkg
• Microsoft.iOS.Runtime.iossimulator-x64.16.2.291-ci.pr.gh17779.nupkg
• Microsoft.iOS.Runtime.iossimulator-x86.16.2.291-ci.pr.gh17779.nupkg
• Microsoft.iOS.Sdk.16.2.291-ci.pr.gh17779.nupkg
• Microsoft.iOS.Templates.16.2.291-ci.pr.gh17779.nupkg
• Microsoft.iOS.Windows.Sdk.16.2.291-ci.pr.gh17779.nupkg
• Microsoft.MacCatalyst.Bundle.16.2.291-ci.pr.gh17779.pkg
• Microsoft.MacCatalyst.Ref.16.2.291-ci.pr.gh17779.nupkg
• Microsoft.MacCatalyst.Runtime.maccatalyst-arm64.16.2.291-ci.pr.gh17779.nupkg
• Microsoft.MacCatalyst.Runtime.maccatalyst-x64.16.2.291-ci.pr.gh17779.nupkg
• Microsoft.MacCatalyst.Sdk.16.2.291-ci.pr.gh17779.nupkg
• Microsoft.MacCatalyst.Templates.16.2.291-ci.pr.gh17779.nupkg
• Microsoft.macOS.Bundle.13.1.291-ci.pr.gh17779.pkg
• Microsoft.macOS.Ref.13.1.291-ci.pr.gh17779.nupkg
• Microsoft.macOS.Runtime.osx-arm64.13.1.291-ci.pr.gh17779.nupkg
• Microsoft.macOS.Runtime.osx-x64.13.1.291-ci.pr.gh17779.nupkg
• Microsoft.macOS.Sdk.13.1.291-ci.pr.gh17779.nupkg
• Microsoft.macOS.Templates.13.1.291-ci.pr.gh17779.nupkg
• Microsoft.NET.Sdk.iOS.Manifest-7.0.100.16.2.291-ci.pr.gh17779.nupkg
• Microsoft.NET.Sdk.MacCatalyst.Manifest-7.0.100.16.2.291-ci.pr.gh17779.nupkg
• Microsoft.NET.Sdk.macOS.Manifest-7.0.100.13.1.291-ci.pr.gh17779.nupkg
• Microsoft.NET.Sdk.tvOS.Manifest-7.0.100.16.1.1079-ci.pr.gh17779.nupkg
• Microsoft.NET.Workload.iOS.16.2.291-ci.pr.gh17779.msi
• Microsoft.tvOS.Bundle.16.1.1079-ci.pr.gh17779.pkg
• Microsoft.tvOS.Ref.16.1.1079-ci.pr.gh17779.nupkg
• Microsoft.tvOS.Runtime.tvos-arm64.16.1.1079-ci.pr.gh17779.nupkg
• Microsoft.tvOS.Runtime.tvossimulator-arm64.16.1.1079-ci.pr.gh17779.nupkg
• Microsoft.tvOS.Runtime.tvossimulator-x64.16.1.1079-ci.pr.gh17779.nupkg
• Microsoft.tvOS.Sdk.16.1.1079-ci.pr.gh17779.nupkg
• Microsoft.tvOS.Templates.16.1.1079-ci.pr.gh17779.nupkg
• xamarin.ios-16.2.1.291.pkg
• xamarin.mac-9.1.1.291.pkg

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