Extract vector_transfer_* Ops into a SuperVectorDialect.

From the beginning, vector_transfer_read and vector_transfer_write opreations
were intended as a mid-level vectorization abstraction.  In particular, they
are lowered to the StandardOps dialect before further processing.  As such, it
does not make sense to keep them at the same level as StandardOps.  Introduce
the new SuperVectorOps dialect and move vector_transfer_* operations there.
This will be used as a testbed for the generic lowering/legalization pass.

PiperOrigin-RevId: 225554492