Move PartitionedArrays support to an extension.

[fredrikekre]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 90.50279% with 17 lines in your changes missing coverage. Please review.

Project coverage is 76.78%. Comparing base (b8317d7) to head (497bfa9).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
ext/HYPREPartitionedArrays.jl	90.50%	17 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #23      +/-   ##
==========================================
+ Coverage   76.74%   76.78%   +0.03%     
==========================================
  Files           4        5       +1     
  Lines        1161     1163       +2     
==========================================
+ Hits          891      893       +2     
  Misses        270      270              

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