Use Traits for ISingleRowDbCommandBuilder/IMultipleRowDbCommandBuilder

[Grauenwolf]

The implantation for ISingleRowDbCommandBuilder and IMultipleRowDbCommandBuilder are exactly the same for each class that uses them. So they are good candidates for being converted into a trait.

[Grauenwolf]

This won't work. We can't put generics on a trait because the UseTrait attribute doesn't accept generic type arguments. For example, we can't write,

[UseTrait(typeof(MyTrait<TCommand, TParameter>))]
class MyCommandBuilder<TCommand, TParameter>