Investigate replacing variadic generics boolean functions with more dynamism

Variadic generics unfortunately are not ergonomic enough for our use case and might potentially be too limited too. For example, the lack of same-element requirements (see [this forum post](https://forums.swift.org/t/variadic-types-same-element-requirements-are-not-yet-supported/67285)) requires us to use [the `BoolConvertible` workaround](https://github.com/fwcd/swift-quantum/blob/c339acc965986cd58d8ca91d3081dc7a8473e109/Sources/Quantum/Program/QuantumOracle%2BFunction.swift#L2-L20) currently.

We might therefore want to have those functions simply operate on e.g. `ClassicalState`. This would likely require specifying the arities explicitly.