Single-register arithmetic gates #13371
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Summary
Part of #13046: Gates for the single-register arithmetic operations.
Details and comments
I'm opening this PR for people to have a look and for more HLS test cases, but this can probably use some more cleanup. Also all the piecewise gates need an auxiliary qubit, which is currently part of the Gate
num_qubits
but probably shouldn't be and instead be handled by a synthesis plugin.Since there's already enough for 1.3 I'd suggest we don't include this.