Implement Compose for Vec<C>

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I've stumbled into an issue where from_iter doesn't update the final compose result/ui when one of the elements in the Iterator changes. Perhaps it is working as intended or is just a bug (issue). In any case, implementing Compose for Vec<C> is a workaround for my issue, as well as being a reasonable implementation in general, in my opinion. Another benefit over using from_iter is that from_iter requires the iterator to implement Data + Clone, while this method does not.

Now, you could do something like this:

#[derive(Data)]
pub struct Something;

impl Compose for Something {
    fn compose(cx: Scope<Self>) -> impl Compose {
        let numbers = [20, 42, 39];

        numbers
            .iter()
            .map(|number| spawn(Text::new(number.to_string())))
            .collect::<Vec<_>>()
    }
}