Add tooling support for required component parameters

[pranavkm]

Follow up to dotnet/aspnetcore#11815. For 5.0, we'll introduce required parameters on components. We'll land tooling support post 5.0.

[ghost]

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We're moving this issue to the Next sprint planning milestone for future evaluation / consideration. We will evaluate the request when we are planning the work for the next milestone. To learn more about what to expect next and how this issue will be handled you can read more about our triage process here.