cubicweb-genomics #3920723 Add Chip etype and clarify the relation between a GenomicMeasure and a Chip [validation pending]

prioritynormal
typebug
done in0.9.0
load0.200
load left0.000
closed by#ebc680a91314 [schema] Add Chip entity type, closes #3920723
patch[schema] Add Chip entity type, closes #3920723 [applied]