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feat: make
StarOrderedRing
a mixin (#11872)
This makes `StarOrderedRing` take `StarRing` as a parameter instead of extending it, and as a result moves the typeclass to `Prop`. It was already a mixin with respect to the order and algebraic structure. There are two primary motivations: 1. This makes it possible to directly assume that `C(α, R)` is a `StarOrderedRing` with `[StarOrderedRing C(α, R)]`, as currently there is no typeclass on `R` which would naturally guarantee this property. This is relevant as we want this type class on continuous functions for the continuous functional calculus. 2. We will eventually want a `StarOrderedRing` instance on `C(α, A)` where `A` is a complex (or even real) C⋆-algebra, and making this a mixin avoids loops with `StarRing`.
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