fix: export Ranked from the prelude

[akern40]

#1575 moved ndim off of Dimension and onto the new Ranked supertrait. Generic code with a D: Dimension bound still works, but calling .ndim() on a concrete dimension type now needs Ranked in scope, so this stopped compiling:

use ndarray::prelude::*;
Ix2(3, 4).ndim(); // E0599: trait `Ranked` is not in scope

This exports Ranked from the prelude next to Dimension. Code that imports ndarray::Dimension directly, rather than going through the prelude, still has to import ndarray::layout::ranked::Ranked too.

CI is red until #1622 lands. That PR fixes lints from newer toolchains that also fail on refactor itself.

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Requested by: @akern40

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