Add wildfire emissions for ICON 2D-Aerosol based on GFAS data

[drieg]

Description

Add wildfire emission climatology which is needed for ICON's 2D-Aerosol implementation. The climatology is based on seasonal averages over 10 years of GFAS emission data from CAMS.

See also the correponding data merge request.

Workflow for merging PRs

Please read these instructions carefully and follow the steps below before requesting a review by the maintainers. This way we can ensure a smoother review process and your changes will be merged sooner.

Additionally, if this is the first PR you open in EXTPAR make sure to read the "Information for EXTPAR Developers" section in the documentation.

Checklist

• Provide a detailed description of your changes in the "Description" section above.
• If you implemented a new feature:
  • Document it in the correct Markdown file(s) under the docs/ directory.
  • Add a new test or make sure your changes are already tested.
• Your code follows the style guidelines.
• Your changes only touch the files/lines relevant for you.
• All four required checks pass (see "Testing and debugging" for more details).
• No conflicts with the base branch.

If all the points above are satisfied you can ask for a review by selecting stelliom as a reviewer.

For any questions please ping @stelliom on this PR.

Testing and debugging

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If you need more details on the testsuite results (e.g., if you are trying to debug an error or you are simply unsure why the tests fail) you can launch the testsuite with launch jenkins(debug). This will run the tests as usual, but, once completed, you will be given a URL (via a comment on the PR) to access the logfiles and namelists of all tests that were run.