Revert unique_ptr usage from Type

[mcakircali]

as discussed with Tiago, remove unique_ptr to keep ECMWF's raw pointer idiom

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 51.35135% with 18 lines in your changes missing coverage. Please review.

Project coverage is 61.20%. Comparing base (5156af4) to head (2345ae9).

Files with missing lines	Patch %	Lines
src/metkit/mars/Type.cc	50.00%	18 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #62      +/-   ##
===========================================
- Coverage    61.31%   61.20%   -0.12%     
===========================================
  Files          102      102              
  Lines         6414     6421       +7     
  Branches       611      611              
===========================================
- Hits          3933     3930       -3     
- Misses        2481     2491      +10     

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[simondsmart]

Looks fine.
My preference would be to keep unique_ptr in the containers, and the raw pointers on the interface.

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[danovaro]

lgtm, thanks @mcakircali