[AppKit] Improve bindings for NSPasteboard and NSPasteboardReading a bit.

[rolfbjarne]

• Create strong enums for NSPasteboardType and NSPasteboardName.
• Bind the NSPasteboardReading constructor.

Ref: #14039

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• xamarin.ios-17.3.0.476.pkg
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✅ API diff for current PR / commit

Legacy Xamarin (No breaking changes)

• iOS (no change detected)
• tvOS (no change detected)
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• macOS: vsdrops gist (No breaking changes)

.NET (No breaking changes)

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• tvOS: (empty diff detected)
• MacCatalyst: (empty diff detected)
• macOS: vsdrops gist (No breaking changes)

✅ 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

• iOS: vsdrops gist
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• macOS: vsdrops gist

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✅ dotnettests (iOS): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (MacCatalyst): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (macOS): All 1 tests passed. Html Report (VSDrops) Download
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✅ mmp: All 2 tests passed. Html Report (VSDrops) Download
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✅ monotouch (macOS): All 8 tests passed. Html Report (VSDrops) Download
✅ monotouch (tvOS): All 11 tests passed. [attempt 3] Html Report (VSDrops) Download
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