[mlir] check interfaces are attached to the expected object

Add static assertions into the various `attachInterface` methods, which are
used for adding external interface implementations to attributes, operations
and types, that ensure `ExternalModel` interface classes are instantiated for
the same concrete operation for the concrete base (potentially self) attribute
or type as they are attached to. `FallbackModel`s remain usable for generic
interface models that should support more than one kind of entities.

Reviewed By: springerm

Differential Revision: https://reviews.llvm.org/D127850