Allow additional dimensions when building pyramids

[meggart]

This allows additional dimensions to exist when building a pyramid. I just got an example working where I built a DGGS pyramid, that had an addtional n dimension.

TODO:

• add a test
• somehow allow to pass chunk information to the output array creation

[felixcremer]

We should copy the test from #42.

[felixcremer]

This should also be the same behaviour for an in-memory built Pyramid and a on disk Zarr Pyramid via buildpyramids.
I am wondering whether we could streamline these two code paths to overlap a bit more.

[felixcremer]

The nightly failure is due to JuliaConcurrent/ConcurrentCollections.jl#66

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.17%. Comparing base (85be5d9) to head (bcee212).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #76      +/-   ##
==========================================
+ Coverage   71.42%   72.17%   +0.74%     
==========================================
  Files           4        4              
  Lines         308      327      +19     
==========================================
+ Hits          220      236      +16     
- Misses         88       91       +3     

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