Add 3D gather/scatter capability#154

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pmarguinaud wants to merge 10 commits into

ecmwf-ifs:mainfrom

pmarguinaud:collapse

Commits on Jun 30, 2026

Merge branch 'main' of https://github.com/ecmwf-ifs/field_api into collapse
pmarguinaud
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Commits on Jul 8, 2026

Test gather/scatter collapse2 feature with arrays whose second dimension is larger than NFLEVG. This can happen when processing arrays with extra levels such as :
pmarguinaud
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Commits on Jul 12, 2026

Return dummy pointer when optional field argument is not present (GET_GATHER_* routines)
pmarguinaud
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Commits on Jul 17, 2026

Hard wire COLLAPSE=2, cleaning
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