Feature/irregular grid mapper

[mathleur]

Create an irregular grid mapper which handles irregular grids and uses a different engine slicer

[jameshawkes]

To be continued... let's try some extractions on ORCA grids and see if it works, then we can tidy it up

[jameshawkes]

remove?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 52.00000% with 336 lines in your changes are missing coverage. Please review.

Project coverage is 84.27%. Comparing base (c3f51b3) to head (85e1741).

Files	Patch %	Lines
...rmations/datacube_mappers/mapper_axis_decorator.py	0.00%	87 Missing ⚠️
tests/test_quad_tree.py	23.52%	78 Missing ⚠️
tests/test_orca_irregular_grid.py	24.00%	38 Missing ⚠️
polytope/datacube/quad_tree.py	78.37%	24 Missing ⚠️
tests/test_quadtree_indices.py	28.00%	18 Missing ⚠️
tests/test_quadtree_optimisation.py	33.33%	18 Missing ⚠️
tests/test_polytope_extract_fdb.py	34.61%	17 Missing ⚠️
polytope/engine/quadtree_slicer.py	70.21%	14 Missing ⚠️
tests/test_quadtree_edge_cases.py	38.88%	11 Missing ⚠️
polytope/engine/engine.py	40.00%	9 Missing ⚠️
... and 5 more

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #112      +/-   ##
===========================================
- Coverage    87.50%   84.27%   -3.23%     
===========================================
  Files           88      101      +13     
  Lines         7099     7754     +655     
===========================================
+ Hits          6212     6535     +323     
- Misses         887     1219     +332     

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