ENH: Revise some patterns of the BIDSLayout config to aid SDCFlows new API
ENH: Revise some patterns of the BIDSLayout config to aid SDCFlows new API

Part-of: nipreps/sdcflows#123.

poldracklab/niworkflows,oesteban/niworkflows,poldracklab/niworkflows,oesteban/niworkflows,oesteban/niworkflows