Accept `IntoIterator` for `Collider::compound` instead of `Vec`

[Shatur]

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You convert it into iterator anyway: https://github.com/Jondolf/avian/blob/7d79ca1148e661d0fc57e8b5b8b381725ef0ad06/src/collision/collider/parry/mod.rs#L668-L683 It would be nice to be able to avoid extra allocations.