Add surface type and terrain elevation to the AWS L1b loading

[adybbroe]

This PR adds surface type and terrain elevation to the Arctic Weather Satellite (AWS) L1b loading.

• Closes #xxxx
• Tests added
• Fully documented
• Add your name to AUTHORS.md if not there already

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.27%. Comparing base (38d7138) to head (d125b53).
⚠️ Report is 271 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3169      +/-   ##
==========================================
- Coverage   96.28%   96.27%   -0.01%     
==========================================
  Files         436      436              
  Lines       57830    57924      +94     
==========================================
+ Hits        55681    55768      +87     
- Misses       2149     2156       +7     

Flag	Coverage Δ
behaviourtests	3.77% <0.00%> (-0.01%)	⬇️
unittests	96.36% <100.00%> (-0.01%)	⬇️

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[djhoese]

Looks good to me. One small question for a possible change, but fine with me as is.

[djhoese]

@adybbroe what's up with these failing tests:

FAILED satpy/tests/reader_tests/test_aws1_mwr_l1c.py::test_get_viewing_geometry_data[solar_azimuth_angle-data/navigation/aws_solar_azimuth_angle-fake_array0] - NotImplementedError: Dataset solar_azimuth_angle not available or not supported yet!
FAILED satpy/tests/reader_tests/test_aws1_mwr_l1c.py::test_get_viewing_geometry_data[solar_zenith_angle-data/navigation/aws_solar_zenith_angle-fake_array1] - NotImplementedError: Dataset solar_zenith_angle not available or not supported yet!
FAILED satpy/tests/reader_tests/test_aws1_mwr_l1c.py::test_get_viewing_geometry_data[satellite_azimuth_angle-data/navigation/aws_satellite_azimuth_angle-fake_array2] - NotImplementedError: Dataset satellite_azimuth_angle not available or not supported yet!
FAILED satpy/tests/reader_tests/test_aws1_mwr_l1c.py::test_get_viewing_geometry_data[satellite_zenith_angle-data/navigation/aws_satellite_zenith_angle-fake_array3] - NotImplementedError: Dataset satellite_zenith_angle not available or not supported yet!

[adybbroe]

@adybbroe what's up with these failing tests:

FAILED satpy/tests/reader_tests/test_aws1_mwr_l1c.py::test_get_viewing_geometry_data[solar_azimuth_angle-data/navigation/aws_solar_azimuth_angle-fake_array0] - NotImplementedError: Dataset solar_azimuth_angle not available or not supported yet!
FAILED satpy/tests/reader_tests/test_aws1_mwr_l1c.py::test_get_viewing_geometry_data[solar_zenith_angle-data/navigation/aws_solar_zenith_angle-fake_array1] - NotImplementedError: Dataset solar_zenith_angle not available or not supported yet!
FAILED satpy/tests/reader_tests/test_aws1_mwr_l1c.py::test_get_viewing_geometry_data[satellite_azimuth_angle-data/navigation/aws_satellite_azimuth_angle-fake_array2] - NotImplementedError: Dataset satellite_azimuth_angle not available or not supported yet!
FAILED satpy/tests/reader_tests/test_aws1_mwr_l1c.py::test_get_viewing_geometry_data[satellite_zenith_angle-data/navigation/aws_satellite_zenith_angle-fake_array3] - NotImplementedError: Dataset satellite_zenith_angle not available or not supported yet!

Yes, my bad. Was a bit too fast there. Should be okay now...

[coveralls]

Pull Request Test Coverage Report for Build 16527840917

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 32 of 32 (100.0%) changed or added relevant lines in 3 files are covered.
• 28 unchanged lines in 4 files lost coverage.
• Overall coverage decreased (-0.006%) to 96.381%

---

Files with Coverage Reduction	New Missed Lines	%
satpy/tests/utils.py	2	93.19%
satpy/tests/reader_tests/gms/test_gms5_vissr_l1b.py	3	98.67%
satpy/tests/reader_tests/gms/test_gms5_vissr_navigation.py	3	97.18%
satpy/composites/viirs.py	20	94.72%

Totals
Change from base Build 16275716766:	-0.006%
Covered Lines:	56063
Relevant Lines:	58168

---

💛 - Coveralls