Feature/irregular grid mapper

[mathleur]

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

[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 :warning:
tests/test_quad_tree.py	23.52%	78 Missing :warning:
tests/test_orca_irregular_grid.py	24.00%	38 Missing :warning:
polytope/datacube/quad_tree.py	78.37%	24 Missing :warning:
tests/test_quadtree_indices.py	28.00%	18 Missing :warning:
tests/test_quadtree_optimisation.py	33.33%	18 Missing :warning:
tests/test_polytope_extract_fdb.py	34.61%	17 Missing :warning:
polytope/engine/quadtree_slicer.py	70.21%	14 Missing :warning:
tests/test_quadtree_edge_cases.py	38.88%	11 Missing :warning:
polytope/engine/engine.py	40.00%	9 Missing :warning:
... and 5 more

Additional details and impacted files

```diff @@ 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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