Fix geo interpolation for aapp data

[ninahakansson]

Switched to use the GeoInterpolator to interpolate the latitudes and longitudes for aapp data.
This gives correct results also near longitude 180 degrees but it is slower.
Added a test that show that interpolation of longitudes fails near longitude 180 degrees for aapp data
before the Interpolator was updated. Test data from file hrpt_metop03_20211129_0631_15888.l1b.

• Closes #xxxx
• Tests added

Before fix:

[codecov]

Codecov Report

Merging #1918 (ab4b750) into main (3de4ff6) will increase coverage by 0.11%.
The diff coverage is 94.28%.

@@            Coverage Diff             @@
##             main    #1918      +/-   ##
==========================================
+ Coverage   93.41%   93.52%   +0.11%     
==========================================
  Files         275      277       +2     
  Lines       40731    41218     +487     
==========================================
+ Hits        38047    38548     +501     
+ Misses       2684     2670      -14     

Flag	Coverage Δ
behaviourtests	4.78% <0.00%> (-0.04%)	⬇️
unittests	94.05% <94.28%> (+0.07%)	⬆️

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

Impacted Files	Coverage Δ
satpy/readers/aapp_l1b.py	89.24% <66.66%> (-0.58%)	⬇️
satpy/tests/reader_tests/test_aapp_l1b.py	100.00% <100.00%> (ø)
satpy/resample.py	79.34% <0.00%> (-0.69%)	⬇️
satpy/readers/seviri_l1b_native.py	85.39% <0.00%> (-0.25%)	⬇️
satpy/modifiers/geometry.py	87.30% <0.00%> (-0.20%)	⬇️
satpy/modifiers/angles.py	96.64% <0.00%> (-0.07%)	⬇️
satpy/readers/ahi_hsd.py	97.25% <0.00%> (-0.05%)	⬇️
satpy/readers/utils.py	91.79% <0.00%> (ø)
satpy/dataset/dataid.py	95.16% <0.00%> (ø)
satpy/writers/geotiff.py	93.22% <0.00%> (ø)
... and 16 more

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[coveralls]

Coverage increased (+0.08%) to 93.985% when pulling ab4b750 on ninahakansson:fix_latlon_interp_aapp into 3de4ff6 on pytroll:main.

[adybbroe]

@ninahakansson Great work. Can you please describe what your PR does and why, in addition from adding more tests? The current description doesn't match the title
And, run isort locallly and/or install pre-commit to your local repo to fix the imports.

[adybbroe]

@ninahakansson In your local satpy fork do:
pre-commit install

To fix for isort now you can do:

pre-commit run isort --all-files or

pre-commit run isort --files satpy/tests/reader_tests/test_aapp_l1b.py

[mraspaud]

Thanks for reporting and fixing this! I think we can just drop the regular interpolator.

[mraspaud]

LGTM