Add runtime annotation support to model.

[AndriySvyryd]

Runtime annotations can only be added to a read-only model and IModelRuntimeInitializer is the service that adds the required ones.
Model validation has been moved to ModelRuntimeInitializer.

Fixes #22031

[smitpatel]

41/128

[roji]

See some comments below, LGTM but will let @smitpatel finish his review.

Quick question for my understanding... Does the fact that the relational model is now a runtime annotation mean that it will not be part of the compiled model, i.e. would be recalculated every time on program startup?

[AndriySvyryd]

Quick question for my understanding... Does the fact that the relational model is now a runtime annotation mean that it will not be part of the compiled model, i.e. would be recalculated every time on program startup?

Not necessarily, A runtime annotation cannot be set while the model is building, but the compiled model can recreate it during initialization and I plan to include extension points for providers to affect the compiled model.

[AndriySvyryd]

@smitpatel Do you still want to finish reviewing this?

[smitpatel]

@AndriySvyryd - Sorry for delay. Moving house was more work than I estimated. (developer issues!). Go ahead with the merging this.

[AndriySvyryd]

I still need a software-friendly approval to be able to merge

[smitpatel]

Done. I thought Shay already did. These machines are making us do things now-a-days.

[ghost]

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[ghost]

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[smitpatel]

Should also rename parameter name?

[AndriySvyryd]

It mirrors the type name and there's no ambiguity here. Or is there?

[smitpatel]

The property name is ScopedModelDependencies. There is so much of inconsistency.
I am fine leaving this as is. With introduction of SingletonModelDependencies, sole ModelDependencies feels somewhat ambiguous to me but may not be worth a breaking change. API review should capture this too.