Add subworkflow for merging SpatialData #281

Job	Run time
Run pipeline with test data (tests/pipeline/test_spaceranger_ffpe_v1.nf.test \| 24.04.2 \| docker)	10m 43s
Run pipeline with test data (tests/pipeline/test_spaceranger_ffpe_v2_cytassist.nf.test \| 24.04.2 \| docker)	14m 58s
Run pipeline with test data (tests/pipeline/test_downstream.nf.test \| 24.04.2 \| docker)	11m 45s
Run pipeline with test data (tests/pipeline/test_spaceranger_ffpe_v1.nf.test \| latest-everything \| docker)	10m 12s
Run pipeline with test data (tests/pipeline/test_spaceranger_ffpe_v2_cytassist.nf.test \| latest-everything \| docker)	11m 58s
Run pipeline with test data (tests/pipeline/test_downstream.nf.test \| latest-everything \| docker)	11m 39s
	1h 11m 15s

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