Metadata: Bring back SqlServerDbFunctionConvention

[smitpatel]

To set schema as dbo conventionally.

It was there in 2.2 release. It got removed at some point. Currently query injects dbo when printing.

[AndriySvyryd]

Depends on #19806 or #9329 for doing it "properly"

Note to implementor: See https://github.com/dotnet/efcore/blob/1644f31e04176a9ab0bd6c968ab00cdb0647a0c2/src/EFCore.SqlServer/Query/Internal/SqlServerQuerySqlGenerator.cs

[smitpatel]

Little more details? 😅

[AndriySvyryd]

@smitpatel Why do you need more details? Are you planning to poach this?

[smitpatel]

May be. I was thinking just a model finalized convention can populate this on SqlServer, without any side-effects or triggering other conventions.

[AndriySvyryd]

Ok, you could do it that way for now. But with #19806 or #9329 the value would be available during OnModelBuilding, which is preferable

[smitpatel]

Poached. (hopefully ok).

I went the route to bringing the convention back because this was in 5.0 but the other issues which would make further improvements are in backlog so I thought we want to go this route meanwhile.