Improve SGRID metadata tooling, add sgrid datasets #1985

Job	Run time
cache-pixi-lock / Generate output	12s
Unit tests: windows \| pixi run -e test tests	5m 39s
Unit tests: ubuntu \| pixi run -e test-py311 tests	3m 48s
Unit tests: ubuntu \| pixi run -e test-py313 tests	3m 49s
Unit tests: ubuntu \| pixi run -e test tests	2m 44s
Unit tests: ubuntu \| pixi run -e test-minimum tests	3m 49s
Integration: ${{ matrix.os }} \| pixi run -e ${{ matrix.pixi-environment }} tests-notebooks	0s
TypeChecking: pixi run typing	0s
merge-test-artifacts	0s
cache-pixi-lock / Generate output	12s
Unit tests: ubuntu \| pixi run -e test tests	2m 40s
Unit tests: windows \| pixi run -e test tests	6m 43s
Unit tests: ubuntu \| pixi run -e test-py313 tests	3m 26s
Unit tests: ubuntu \| pixi run -e test-py311 tests	3m 39s
Unit tests: ubuntu \| pixi run -e test-minimum tests	3m 29s
Integration: ${{ matrix.os }} \| pixi run -e ${{ matrix.pixi-environment }} tests-notebooks	-44953s
TypeChecking: pixi run typing	-44953s
merge-test-artifacts	0s
	-87496s

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