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

[tj-devel709]

This PR aims to bring nullability changes to StoreKit.
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
2. Changing any == null or != null to is null and is not null

[dalexsoto]

After @mandel-macaque 👍

[tj-devel709]

@mandel-macaque @rolfbjarne Updated!

[tj-devel709]

Unrelated Test Failures due to unrelated Timeouts!

[tj-devel709]

This one is ready to merge after approval from @mandel-macaque

[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-1107.Monterey'
Merge 3afbec6 into 0ec49ff

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• Microsoft.iOS.Bundle.15.4.62-ci.pr.gh14896.pkg
• Microsoft.iOS.Ref.15.4.62-ci.pr.gh14896.nupkg
• Microsoft.iOS.Runtime.ios-arm.15.4.62-ci.pr.gh14896.nupkg
• Microsoft.iOS.Runtime.ios-arm64.15.4.62-ci.pr.gh14896.nupkg
• Microsoft.iOS.Runtime.iossimulator-arm64.15.4.62-ci.pr.gh14896.nupkg
• Microsoft.iOS.Runtime.iossimulator-x64.15.4.62-ci.pr.gh14896.nupkg
• Microsoft.iOS.Runtime.iossimulator-x86.15.4.62-ci.pr.gh14896.nupkg
• Microsoft.iOS.Sdk.15.4.62-ci.pr.gh14896.nupkg
• Microsoft.iOS.Templates.15.4.62-ci.pr.gh14896.nupkg
• Microsoft.iOS.Windows.Sdk.15.4.62-ci.pr.gh14896.nupkg
• Microsoft.MacCatalyst.Bundle.15.4.62-ci.pr.gh14896.pkg
• Microsoft.MacCatalyst.Ref.15.4.62-ci.pr.gh14896.nupkg
• Microsoft.MacCatalyst.Runtime.maccatalyst-arm64.15.4.62-ci.pr.gh14896.nupkg
• Microsoft.MacCatalyst.Runtime.maccatalyst-x64.15.4.62-ci.pr.gh14896.nupkg
• Microsoft.MacCatalyst.Sdk.15.4.62-ci.pr.gh14896.nupkg
• Microsoft.MacCatalyst.Templates.15.4.62-ci.pr.gh14896.nupkg
• Microsoft.macOS.Bundle.12.3.62-ci.pr.gh14896.pkg
• Microsoft.macOS.Ref.12.3.62-ci.pr.gh14896.nupkg
• Microsoft.macOS.Runtime.osx-arm64.12.3.62-ci.pr.gh14896.nupkg
• Microsoft.macOS.Runtime.osx-x64.12.3.62-ci.pr.gh14896.nupkg
• Microsoft.macOS.Sdk.12.3.62-ci.pr.gh14896.nupkg
• Microsoft.macOS.Templates.12.3.62-ci.pr.gh14896.nupkg
• Microsoft.NET.Sdk.iOS.Manifest-6.0.300.15.4.62-ci.pr.gh14896.nupkg
• Microsoft.NET.Sdk.MacCatalyst.Manifest-6.0.300.15.4.62-ci.pr.gh14896.nupkg
• Microsoft.NET.Sdk.macOS.Manifest-6.0.300.12.3.62-ci.pr.gh14896.nupkg
• Microsoft.NET.Sdk.tvOS.Manifest-6.0.300.15.4.62-ci.pr.gh14896.nupkg
• Microsoft.NET.Workload.iOS.15.4.62-ci.pr.gh14896.msi
• Microsoft.tvOS.Bundle.15.4.62-ci.pr.gh14896.pkg
• Microsoft.tvOS.Ref.15.4.62-ci.pr.gh14896.nupkg
• Microsoft.tvOS.Runtime.tvos-arm64.15.4.62-ci.pr.gh14896.nupkg
• Microsoft.tvOS.Runtime.tvossimulator-arm64.15.4.62-ci.pr.gh14896.nupkg
• Microsoft.tvOS.Runtime.tvossimulator-x64.15.4.62-ci.pr.gh14896.nupkg
• Microsoft.tvOS.Sdk.15.4.62-ci.pr.gh14896.nupkg
• Microsoft.tvOS.Templates.15.4.62-ci.pr.gh14896.nupkg
• xamarin.ios-15.11.0.250.pkg
• xamarin.mac-8.11.0.250.pkg

Pipeline on Agent XAMBOT-1109.Monterey'
Hash: ea2bf7fab89e54ca88e9fc9314d63e09a4fd79f8

[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: ea2bf7fab89e54ca88e9fc9314d63e09a4fd79f8

[vs-mobiletools-engineering-service2]

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Pipeline on Agent XAMBOT-1017.Monterey'
Hash: ea2bf7fab89e54ca88e9fc9314d63e09a4fd79f8

[vs-mobiletools-engineering-service2]

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

Failed tests are:

• xammac_tests
• monotouch-test

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Hash: ea2bf7fab89e54ca88e9fc9314d63e09a4fd79f8

[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-1096.Monterey'
Merge ea2bf7f into 5249316