Qiskit / qiskit / 13287579230

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Commit Message

Leverage native UnitaryGate from rust (#13765)

This commit builds off of the native rust representation of a
UnitaryGate added in #13759 and uses the native representation
everywhere we were using UnitaryGate in rust via python previously:
the quantum_volume() function, consolidate blocks, split2qunitaries,
and unitary synthesis.

One future item is consolidate blocks can be updated to use nalgebra
types internally instead of ndarray as for the 1 and 2q cases we know
the fixed size of the array ahead of time. However the block
consolidation code is built using ndarray currently and later synthesis
code also works in ndarray so there isn't any real benefit yet, and we'd
just add unecessary conversions and allocations. However, once #13649
merges this will change and it would make more sense to add the unitary
gate with a Matrix4. But this can be handled separately after this
merges.

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