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

[tj-devel709]

This PR aims to bring nullability changes to iTunesLibrary.
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

[vs-mobiletools-engineering-service2]

🔥 Tests failed catastrophically on VSTS: simulator tests iOS (no summary found). 🔥

Result file D:\a\1\s\Reports\TestSummary-simulator\TestSummary.md not found.

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Pipeline on Agent XAMBOT-1035.Monterey'
Merge b35633b into 82482ed

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• Microsoft.iOS.Bundle.15.4.60-ci.pr.gh14967.pkg
• Microsoft.iOS.Ref.15.4.60-ci.pr.gh14967.nupkg
• Microsoft.iOS.Runtime.ios-arm.15.4.60-ci.pr.gh14967.nupkg
• Microsoft.iOS.Runtime.ios-arm64.15.4.60-ci.pr.gh14967.nupkg
• Microsoft.iOS.Runtime.iossimulator-arm64.15.4.60-ci.pr.gh14967.nupkg
• Microsoft.iOS.Runtime.iossimulator-x64.15.4.60-ci.pr.gh14967.nupkg
• Microsoft.iOS.Runtime.iossimulator-x86.15.4.60-ci.pr.gh14967.nupkg
• Microsoft.iOS.Sdk.15.4.60-ci.pr.gh14967.nupkg
• Microsoft.iOS.Templates.15.4.60-ci.pr.gh14967.nupkg
• Microsoft.iOS.Windows.Sdk.15.4.60-ci.pr.gh14967.nupkg
• Microsoft.MacCatalyst.Bundle.15.4.60-ci.pr.gh14967.pkg
• Microsoft.MacCatalyst.Ref.15.4.60-ci.pr.gh14967.nupkg
• Microsoft.MacCatalyst.Runtime.maccatalyst-arm64.15.4.60-ci.pr.gh14967.nupkg
• Microsoft.MacCatalyst.Runtime.maccatalyst-x64.15.4.60-ci.pr.gh14967.nupkg
• Microsoft.MacCatalyst.Sdk.15.4.60-ci.pr.gh14967.nupkg
• Microsoft.MacCatalyst.Templates.15.4.60-ci.pr.gh14967.nupkg
• Microsoft.macOS.Bundle.12.3.60-ci.pr.gh14967.pkg
• Microsoft.macOS.Ref.12.3.60-ci.pr.gh14967.nupkg
• Microsoft.macOS.Runtime.osx-arm64.12.3.60-ci.pr.gh14967.nupkg
• Microsoft.macOS.Runtime.osx-x64.12.3.60-ci.pr.gh14967.nupkg
• Microsoft.macOS.Sdk.12.3.60-ci.pr.gh14967.nupkg
• Microsoft.macOS.Templates.12.3.60-ci.pr.gh14967.nupkg
• Microsoft.NET.Sdk.iOS.Manifest-6.0.300.15.4.60-ci.pr.gh14967.nupkg
• Microsoft.NET.Sdk.MacCatalyst.Manifest-6.0.300.15.4.60-ci.pr.gh14967.nupkg
• Microsoft.NET.Sdk.macOS.Manifest-6.0.300.12.3.60-ci.pr.gh14967.nupkg
• Microsoft.NET.Sdk.tvOS.Manifest-6.0.300.15.4.60-ci.pr.gh14967.nupkg
• Microsoft.NET.Workload.iOS.15.4.60-ci.pr.gh14967.msi
• Microsoft.tvOS.Bundle.15.4.60-ci.pr.gh14967.pkg
• Microsoft.tvOS.Ref.15.4.60-ci.pr.gh14967.nupkg
• Microsoft.tvOS.Runtime.tvos-arm64.15.4.60-ci.pr.gh14967.nupkg
• Microsoft.tvOS.Runtime.tvossimulator-arm64.15.4.60-ci.pr.gh14967.nupkg
• Microsoft.tvOS.Runtime.tvossimulator-x64.15.4.60-ci.pr.gh14967.nupkg
• Microsoft.tvOS.Sdk.15.4.60-ci.pr.gh14967.nupkg
• Microsoft.tvOS.Templates.15.4.60-ci.pr.gh14967.nupkg
• xamarin.ios-15.11.0.248.pkg
• xamarin.mac-8.11.0.248.pkg

Pipeline on Agent XAMBOT-1103.Monterey'
Hash: 15aff821418890aae25c83cd16444b831de6fccc

[vs-mobiletools-engineering-service2]

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

✅ All tests on macOS Mac Catalina (10.15) passed.

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Hash: 15aff821418890aae25c83cd16444b831de6fccc

[vs-mobiletools-engineering-service2]

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

Failed tests are:

• xammac_tests
• monotouch-test

Pipeline on Agent
Hash: 15aff821418890aae25c83cd16444b831de6fccc

[vs-mobiletools-engineering-service2]

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Pipeline on Agent XAMBOT-1098.Monterey'
Hash: 15aff821418890aae25c83cd16444b831de6fccc

[vs-mobiletools-engineering-service2]

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

Tests passed on VSTS: simulator tests iOS.

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🎉 All 148 tests passed 🎉

Pipeline on Agent XAMBOT-1102.Monterey'
Merge 15aff82 into 3322f33