Add benchmarks for seviri hrit

[mraspaud]

This PR adds download/demo methods for SEVIRI data in HRIT format and some benchmarks

• Tests added
• Fully documented

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[codecov]

Codecov Report

Merging #1760 (54bd52e) into main (4d34625) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1760      +/-   ##
==========================================
+ Coverage   92.82%   92.87%   +0.04%     
==========================================
  Files         263      265       +2     
  Lines       38717    38853     +136     
==========================================
+ Hits        35940    36084     +144     
+ Misses       2777     2769       -8     

Flag	Coverage Δ
behaviourtests	4.78% <0.00%> (-0.02%)	⬇️
unittests	93.41% <100.00%> (+0.04%)	⬆️

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

Impacted Files	Coverage Δ
satpy/demo/__init__.py	100.00% <100.00%> (ø)
satpy/demo/ahi_hsd.py	95.83% <100.00%> (ø)
satpy/demo/seviri_hrit.py	100.00% <100.00%> (ø)
satpy/demo/utils.py	100.00% <100.00%> (ø)
satpy/demo/viirs_sdr.py	100.00% <100.00%> (ø)
satpy/tests/test_demo.py	99.29% <100.00%> (+0.33%)	⬆️
satpy/tests/reader_tests/test_vii_base_nc.py	98.78% <0.00%> (+1.21%)	⬆️
satpy/tests/reader_tests/test_nwcsaf_msg.py	98.31% <0.00%> (+1.68%)	⬆️
... and 2 more

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[coveralls]

Coverage remained the same at 93.357% when pulling 54bd52e on mraspaud:feature-hrit-benchmarks into 4d34625 on pytroll:main.

[djhoese]

One clean code suggestion, one confusion with possibly broken code, but otherwise I'm guessing this filesystem stuff in the tests avoids touching disk completely? Is this something the VIIRS SDR tests could be updated with?

[mraspaud]

I'm running the benchmarks now locally, but I think this is ready

[mraspaud]

As for the filesystem stuff, maybe it could work for viirs, I can give it a try.

[mraspaud]

I'm merging this to have time to run all the benchmarks today on EWC