Co-authored-by: Angus Hollands <[email protected]>

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The test didn't catch that when modifying an awkward array in a
AnnDataView, the changes did not persist within that view.

The issue was that I had been retreiving the awkward array
from the view once, and then did tests on it. Instead, to properly
test this, I need to retreive the Awkward array from the AnnData view
every time. It turns out doing so gives me a fresh copy of the origina
awkward array and modifications only affect that copy - not the original data.

I solved the issue described in the previous commit by adding
logic to `AlignedViewMixin` that can copy objects of a certain type
(for now only awkward arrays) upon view creation.