Fix hashing of definitions for non contiguous arrays

[mraspaud]

This PR fixes the hashing of definitions based on non contiguous arrays

• Closes SwathDefinition.update_hash() raise error after slicing the swath object #439
• Tests added
• Tests passed

[mraspaud]

@ghiggi could you check if this solves your problem?

[mraspaud]

To provide more info: ascontiguousarray returns the original array when it is already contiguous. So copies only happen in the subsetting case.

[codecov]

Codecov Report

Merging #462 (665dd78) into main (8da4081) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #462   +/-   ##
=======================================
  Coverage   94.28%   94.28%           
=======================================
  Files          69       69           
  Lines       12388    12394    +6     
=======================================
+ Hits        11680    11686    +6     
  Misses        708      708           

Flag	Coverage Δ
unittests	94.28% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pyresample/geometry.py	87.17% <100.00%> (ø)
pyresample/test/test_geometry.py	99.51% <100.00%> (+<0.01%)	⬆️

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[ghiggi]

@mraspaud yes it has solved the problem. Thanks !