Initial implementation of EUMETSAT IASI-NG reader

[roche-emmanuel]

This PR introduces the initial implementation of the IASI-NG reader for Satpy.

The changes provided here are self-contained in three files:

• satpy/readers/iasi_ng_l2_nc.py: The implementation file for the reader.
• satpy/etc/readers/iasi_ng_l2_nc.yaml: The YAML configuration file for the reader.
• satpy/tests/reader_tests/test_iasi_ng_l2_nc.py: The unit tests for the reader.

There are still a few points I need to address (this list may be extended progressively):

• Check support for products with two-letter names (O3_ and CO_), as I don't think they will pass the current file pattern.
• Confirm with the EUMETSAT team whether the processing logic needs to be adjusted (awaiting clarification on some points concerning the product file specs).
• Extend the unit tests to perform more comprehensive checks on different products (currently only testing with TWV).
• Clean the code and remove debug outputs (e.g., print(...) statements).
• Clarify what needs to be done/added concerning the documentation of this reader.
• Add my name to the AUTHORS.md file.

The idea here is to start this PR early in the development phase to get early feedback and review notes from you, ensuring we are on the right track for eventual PR acceptance.

If you have any feedback on this PR already, please let me know 😊! In the meantime, I will continue working on the points mentioned above and will provide additional details on the changes as they are made on the feature branch.

Thanks for your help 🙏!

[roche-emmanuel]

Alright, so I see from the workflows above that there are some failures due to the formatting of the file, I should maybe start with this before moving forward with the remaining code changes 😉.

[codecov]

Codecov Report

Attention: Patch coverage is 98.36735% with 8 lines in your changes missing coverage. Please review.

Project coverage is 96.11%. Comparing base (a4b8c8d) to head (1a7b8f6).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
satpy/readers/iasi_ng_l2_nc.py	96.35%	7 Missing ⚠️
satpy/tests/reader_tests/test_iasi_ng_l2_nc.py	99.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2879      +/-   ##
==========================================
+ Coverage   96.09%   96.11%   +0.02%     
==========================================
  Files         377      379       +2     
  Lines       55074    55564     +490     
==========================================
+ Hits        52924    53406     +482     
- Misses       2150     2158       +8     

Flag	Coverage Δ
behaviourtests	3.91% <0.00%> (-0.04%)	⬇️
unittests	96.21% <98.36%> (+0.01%)	⬆️

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[coveralls]

Pull Request Test Coverage Report for Build 11507327103

Details

• 484 of 492 (98.37%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 96.221%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
satpy/tests/reader_tests/test_iasi_ng_l2_nc.py	298	299	99.67%
satpy/readers/iasi_ng_l2_nc.py	186	193	96.37%

Totals
Change from base Build 11485792071:	0.02%
Covered Lines:	53652
Relevant Lines:	55759

---

💛 - Coveralls

[roche-emmanuel]

Hi everyone,

We now think that this MR is ready for a review by the Satpy team, so please let me know if you have any feedback on it. Thanks 😉!