Concrete run method signatures in contexts

[deusaquilus]

In previous version of ProtoQuill there was no InternalApi and the run methods were used
on a context directly. This caused a problem where doing something like:

  val list: List[RightType] = run(query[WrongType])

Will yield:

  Found: ctx.Result[List[WrongType]] Required: List[RightType]

This was even worse if the types were more complex e.g. for ZIO:

  val list: ZIO[Has[DataSource], SQLException, List[RightType]] = run(query[WrongType])

Will yield:

  Found: QuillContext.Result[List[WrongType]] Required: ZIO[Has[DataSource], SQLException, List[RightType]]

This is quite confusing. Therefore we define the methods in an object and then
delegate to these in the individual contexts.

That way the correct type will be asked for:

Found: ZIO[Has[DataSource], SQLException, List[WrongType]] 
Required: ZIO[Has[DataSource], SQLException, List[RightType]]