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

[tj-devel709]

This PR aims to bring nullability changes to TVServices.
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-1039.Monterey'
Merge b117be2 into 1be1d74

[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-1163.Monterey'
Merge d335fe2 into 01459ae

[vs-mobiletools-engineering-service2]

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Pipeline on Agent XAMBOT-1096.Monterey
Hash: a3286da7fd36b2ada53f1cb45dcd09e31f62564b

[vs-mobiletools-engineering-service2]

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

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

Pipeline on Agent
Hash: a3286da7fd36b2ada53f1cb45dcd09e31f62564b

[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: a3286da7fd36b2ada53f1cb45dcd09e31f62564b

[vs-mobiletools-engineering-service2]

📋 [PR Build] API Diff 📋

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• iOS vsdrops gist
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• dotnet-iOS vsdrops gist
• dotnet-macOS vsdrops gist
• dotnet-tvOS vsdrops gist
• dotnet-MacCatalyst vsdrops gist

View dotnet legacy API diff

• dotnet-legacy-iOS vsdrops gist
• dotnet-legacy-macOS vsdrops gist
• dotnet-legacy-tvOS vsdrops gist

View dotnet iOS-MacCatalayst API diff

• dotnet-macCatiOS vsdrops gist

API diff

✅ API Diff from stable

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• iOS vsdrops gist
• macOS vsdrops gist
• tvOS vsdrops gist
• watchOS vsdrops gist

View dotnet API diff

• dotnet-iOS vsdrops gist
• dotnet-macOS vsdrops gist
• dotnet-tvOS vsdrops gist
• dotnet-MacCatalyst vsdrops gist

View dotnet legacy API diff

• dotnet-legacy-iOS vsdrops gist
• dotnet-legacy-macOS vsdrops gist
• dotnet-legacy-tvOS vsdrops gist

View dotnet iOS-MacCatalayst API diff

• dotnet-macCatiOS vsdrops gist

Generator diff

✅ Generator Diff (no change)

Pipeline on Agent XAMBOT-1103.Monterey'
Hash: a3286da7fd36b2ada53f1cb45dcd09e31f62564b

[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-1100.Monterey'
Merge a3286da into 82482ed