Blazor generic type contraints

[guardrex]

Revert #17350 and cover the feature for 5.0.

Engineering issue: Allow generic type constraints (dotnet/aspnetcore #8433)

UPDATE as of 8/17/2020 — The engineering issue has been moved to the backlog.

UPDATE as of 4/1/2021 — This is ON for 6.0.

Blog Post: https://devblogs.microsoft.com/aspnet/asp-net-core-updates-in-net-6-preview-4/#generic-type-constraints-in-razor

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Document Details

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• ID: 7e918d36-59d2-2264-e6b3-27071cda549c
• Version Independent ID: c7e7e5bc-4686-d641-4f1e-da2de7491758
• Content: ASP.NET Core Blazor templated components
• Content Source: aspnetcore/blazor/templated-components.md
• Product: aspnet-core
• Technology: aspnetcore-blazor
• GitHub Login: @guardrex
• Microsoft Alias: riande