Improve gate fusion #667
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This allows fusion of arbitrary number of qubits and any operation supported by the unitary simulator
Currently this only applies for density matrix simulation method Add more detailed fusion metadata
This can now be gotten through input_ops from verbose
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Summary
Refactor gate fusion transpilation to use the Unitary state simulator or superoperator state simulator for fusing instructions. This also allows fusion of superoperator instructions in noisy circuits for density matrix simulation.
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Partial closes #616