ECC-2335: Improve figure and shapeOfTheEarth handling

[joobog]

Description

This pull request enhances the handling of the "figure" (shape of the reference system, e.g., Earth or Sun) in GRIB grid specifications, improving both encoding and decoding. It introduces support for identifying and naming the figure in the GRIB spec, updates the logic for setting and retrieving the figure, and adjusts tests to verify these changes.

Contributor Declaration

By opening this pull request, I affirm the following:

• All authors agree to the Contributor License Agreement.
• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (hotfix/2.48.3@037c57e). Learn more about missing BASE report.

Additional details and impacted files

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##             hotfix/2.48.3     #557   +/-   ##
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  Files                    ?      855           
  Lines                    ?    63709           
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  Hits                     ?    56075           
  Misses                   ?     7634           
  Partials                 ?        0           

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[sawom666]

This code table is only valid for GRIB edition 2. Somewhere there has to be a check the GRIB in question is edition 2 otherwise an error must be posted

[joobog]

Thanks for the comment. That’s correct, the table and the different shapes are only defined in GRIB2. I think that’s fine here because fillGrib(), which calls table_32_code(), already checks for edition = 2.