Add support for returning extra related records in info panel

Config syntax (only ODBC at the moment):

:mapkey maps to feature.id()

	selectlayerconfig:
	  playground_component:
	    info2:
	      type: sql
	      query: "SELECT * FROM playground.component_inspections WHERE component_id = :mapkey"
	      connection: from_layer
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Use new method for info1 too
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