Fix angle caching not handling a specific type of irregular chunking

[djhoese]

In #2483 @simonrp84 ran into a case where chunks where the last chunk is larger than the first chunk fail to save to zarr in dask, but are supposed to be caught and rechunked automatically by Satpy. They weren't being rechunked which was causing an error. This PR fixes that.

• Closes Cacheing doesn't work with scn.crop #2483
• Tests added
• Fully documented

[coveralls]

Pull Request Test Coverage Report for Build 4996174977

• 5 of 5 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.0004%) to 95.399%

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Totals
Change from base Build 4995535188:	0.0004%
Covered Lines:	46983
Relevant Lines:	49249

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💛 - Coveralls

[codecov]

Codecov Report

Merging #2485 (1be309b) into main (bc9c089) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #2485   +/-   ##
=======================================
  Coverage   94.82%   94.83%           
=======================================
  Files         337      337           
  Lines       49406    49425   +19     
=======================================
+ Hits        46851    46870   +19     
  Misses       2555     2555           

Flag	Coverage Δ
behaviourtests	4.43% <0.00%> (-0.01%)	⬇️
unittests	95.45% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
satpy/modifiers/angles.py	99.17% <100.00%> (+<0.01%)	⬆️
satpy/tests/modifier_tests/test_angles.py	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

[djhoese]

Tested locally with Simon's help. Works. Merging...