support more multi-controlled gates in converters

[CalMacCQ]

I'm adding support for general multi-controlled gates in the qiskit converters.

Note that the diff here is a bit inflated by my VScode plugin reordering the imports (forgot to disable this) hopefully it doesn't upset mypy/pylint. Let me know if I should make a fresh PR.

Changes

1. Fixed handling of CnRy gates. These used to be supported but after Conversion rebase #10 these were decomposed by the rebase prior to conversion. Adding the CnRy gate to the target gateset should take care of this.
2. Added support for CnY and CnZ gates. I previously thought this would be annoying to add Add CnY and CnZ gates to converters #11 - turns out its easy.
3. Support other controlled gates using QControlBox Add support for general controlled gates in converters #28

Also...
4. (A suggestion) - We frequently use conditions like if type(i) == ControlledGate rather a lot. Shouldn't we be using if isinstance(i, ControlledGate) ? https://switowski.com/blog/type-vs-isinstance/