Add `FieldSet.from_sgrid_conventions()` #1990

Job	Run time
cache-pixi-lock / Generate output	1m 27s
Unit tests: ubuntu \| pixi run -e test-py311 tests	3m 52s
Unit tests: ubuntu \| pixi run -e test tests	2m 43s
Unit tests: windows \| pixi run -e test tests	6m 53s
Unit tests: ubuntu \| pixi run -e test-py313 tests	3m 35s
Unit tests: ubuntu \| pixi run -e test-minimum tests	3m 45s
TypeChecking: pixi run typing	0s
Integration: ${{ matrix.os }} \| pixi run -e ${{ matrix.pixi-environment }} tests-notebooks	0s
merge-test-artifacts	0s
	22m 15s

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