Support correct() for public API

I realized after tagging last night that correct() was a major missing ingredient for use of the QrackSimulator API with sim under QrackAceBackend, so this patch adds it. Also, upon review of ccx, the ancillary gadget check didn't actually appear to do anything productive, so a bunch of unnecessary code was cleared out of the method. (This implies that better custom error correction of ccx is possible in user code, for now, but it might require significant ancillary qubit resources.)

Full Changelog: v2.29.0...v2.29.1

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