[mlir][spirv][gpu] Add conversion for load/store/mad coop matrix ops (#66311)

This is plugged in as an alternative lowering path in the gpu to spirv
dialect conversion. Add custom op builders for coop matrix ops to make
the create functions nicer to work with and less error-prone. The latter
is accomplished by following the op syntax and also requiring stride to
be a constant op to avoid confusion around the order of arguments.

The remaining lowering patterns will be added in a future patch.