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This fixes bevyengine#1686. `size_hint` can be useful even if a little niche. For example, `collect::<Vec<_>>()` uses the `size_hint` of Iterator it collects from to pre-allocate a memory slice large enough to not require re-allocating when pushing all the elements of the iterator. To this effect I made the following changes: * Add a `IS_ARCHETYPAL` associated constant to the `Fetch` trait, this constant tells us when it is safe to assume that the `Fetch` relies exclusively on archetypes to filter queried entities * Add `IS_ARCHETYPAL` to all the implementations of `Fetch` * Use that constant in `QueryIter::size_hint` to provide a more useful minima when it's possible to predict the exact size of the query. The new associated constant is an API breaking change. For the user, if they implemented a custom `Fetch`, it means they have to add this associated constant to their implementation.
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