[corespotlight] Add nullability to (generated and manual) bindings

[tj-devel709]

This PR aims to bring nullability changes to CoreSpotlight.
Following the steps here:

1. I am adding nullable enable to all manual files that are not "API_SOURCES" in src/frameworks.sources and making the required nullability changes

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• Microsoft.iOS.Bundle.15.4.63-ci.pr.gh15023.pkg
• Microsoft.iOS.Ref.15.4.63-ci.pr.gh15023.nupkg
• Microsoft.iOS.Runtime.ios-arm.15.4.63-ci.pr.gh15023.nupkg
• Microsoft.iOS.Runtime.ios-arm64.15.4.63-ci.pr.gh15023.nupkg
• Microsoft.iOS.Runtime.iossimulator-arm64.15.4.63-ci.pr.gh15023.nupkg
• Microsoft.iOS.Runtime.iossimulator-x64.15.4.63-ci.pr.gh15023.nupkg
• Microsoft.iOS.Runtime.iossimulator-x86.15.4.63-ci.pr.gh15023.nupkg
• Microsoft.iOS.Sdk.15.4.63-ci.pr.gh15023.nupkg
• Microsoft.iOS.Templates.15.4.63-ci.pr.gh15023.nupkg
• Microsoft.iOS.Windows.Sdk.15.4.63-ci.pr.gh15023.nupkg
• Microsoft.MacCatalyst.Bundle.15.4.63-ci.pr.gh15023.pkg
• Microsoft.MacCatalyst.Ref.15.4.63-ci.pr.gh15023.nupkg
• Microsoft.MacCatalyst.Runtime.maccatalyst-arm64.15.4.63-ci.pr.gh15023.nupkg
• Microsoft.MacCatalyst.Runtime.maccatalyst-x64.15.4.63-ci.pr.gh15023.nupkg
• Microsoft.MacCatalyst.Sdk.15.4.63-ci.pr.gh15023.nupkg
• Microsoft.MacCatalyst.Templates.15.4.63-ci.pr.gh15023.nupkg
• Microsoft.macOS.Bundle.12.3.63-ci.pr.gh15023.pkg
• Microsoft.macOS.Ref.12.3.63-ci.pr.gh15023.nupkg
• Microsoft.macOS.Runtime.osx-arm64.12.3.63-ci.pr.gh15023.nupkg
• Microsoft.macOS.Runtime.osx-x64.12.3.63-ci.pr.gh15023.nupkg
• Microsoft.macOS.Sdk.12.3.63-ci.pr.gh15023.nupkg
• Microsoft.macOS.Templates.12.3.63-ci.pr.gh15023.nupkg
• Microsoft.NET.Sdk.iOS.Manifest-6.0.300.15.4.63-ci.pr.gh15023.nupkg
• Microsoft.NET.Sdk.MacCatalyst.Manifest-6.0.300.15.4.63-ci.pr.gh15023.nupkg
• Microsoft.NET.Sdk.macOS.Manifest-6.0.300.12.3.63-ci.pr.gh15023.nupkg
• Microsoft.NET.Sdk.tvOS.Manifest-6.0.300.15.4.63-ci.pr.gh15023.nupkg
• Microsoft.NET.Workload.iOS.15.4.63-ci.pr.gh15023.msi
• Microsoft.tvOS.Bundle.15.4.63-ci.pr.gh15023.pkg
• Microsoft.tvOS.Ref.15.4.63-ci.pr.gh15023.nupkg
• Microsoft.tvOS.Runtime.tvos-arm64.15.4.63-ci.pr.gh15023.nupkg
• Microsoft.tvOS.Runtime.tvossimulator-arm64.15.4.63-ci.pr.gh15023.nupkg
• Microsoft.tvOS.Runtime.tvossimulator-x64.15.4.63-ci.pr.gh15023.nupkg
• Microsoft.tvOS.Sdk.15.4.63-ci.pr.gh15023.nupkg
• Microsoft.tvOS.Templates.15.4.63-ci.pr.gh15023.nupkg
• xamarin.ios-15.11.0.251.pkg
• xamarin.mac-8.11.0.251.pkg

Pipeline on Agent XAMBOT-1106.Monterey'
Hash: c29f5edcaa2be1230acfa2bbe1230e4749e263f0

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💻 [PR Build] Tests on macOS Mac Catalina (10.15) passed 💻

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Hash: c29f5edcaa2be1230acfa2bbe1230e4749e263f0

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Pipeline on Agent XAMBOT-1036.Monterey'
Hash: c29f5edcaa2be1230acfa2bbe1230e4749e263f0

[vs-mobiletools-engineering-service2]

❌ [PR Build] Tests on macOS M1 - Mac Big Sur (11.5) failed ❌

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• monotouch-test

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✅ [CI Build] Tests passed on VSTS: simulator tests iOS. ✅

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Pipeline on Agent XAMBOT-1108.Monterey'
Merge c29f5ed into 4d3ef30