PtrArrays extension

[lkdvos]

The new version seems to have broken the compatibility with PtrArrays.jl, since reshape(::PtrArray) produces a lazy reshaped array, which then no longer is a subtype of DenseArray.

Here I simply circumvent that issue by correctly reshaping the PtrArray manually, but probably it is also fair to be slightly more conservative and only define the _normalizeparent function for Array -- making this functionality more opt-in instead of opt-out.
@Jutho if you agree, I'll address that in a separate PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.78%. Comparing base (f4d8121) to head (19e3b1b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #16      +/-   ##
==========================================
+ Coverage   91.70%   91.78%   +0.08%     
==========================================
  Files           4        5       +1     
  Lines         205      207       +2     
==========================================
+ Hits          188      190       +2     
  Misses         17       17              

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[Jutho]

I would be in favor of only doing the _normalizeparent for Array instances. I think I had that as a comment on the previous PR, but then since it wasn't changed afterwards, I didn't want to push for it.