Feature/xarray refactoring

[mathleur]

Make transformations and datacube backends separate/independent

[codecov-commenter]

Codecov Report

Patch coverage: 94.50% and project coverage change: +0.15% 🎉

Comparison is base (d5be964) 96.88% compared to head (b26a469) 97.04%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #61      +/-   ##
===========================================
+ Coverage    96.88%   97.04%   +0.15%     
===========================================
  Files           40       46       +6     
  Lines         5235     5374     +139     
===========================================
+ Hits          5072     5215     +143     
+ Misses         163      159       -4     

Files Changed	Coverage Δ
polytope/datacube/backends/mock.py	87.50% <66.66%> (ø)
polytope/datacube/backends/datacube.py	89.74% <78.57%> (ø)
...tacube/transformations/datacube_transformations.py	82.22% <82.22%> (ø)
...lytope/datacube/transformations/datacube_cyclic.py	92.85% <92.85%> (ø)
...ytope/datacube/transformations/datacube_reverse.py	92.85% <92.85%> (ø)
...lytope/datacube/transformations/datacube_merger.py	93.65% <93.65%> (ø)
polytope/datacube/datacube_axis.py	91.89% <96.36%> (+3.94%)	⬆️
polytope/datacube/backends/xarray.py	97.03% <97.03%> (ø)
...ytope/datacube/transformations/datacube_mappers.py	98.46% <97.22%> (ø)
polytope/datacube/__init__.py	100.00% <100.00%> (ø)
... and 22 more

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