Add sdl feature to pa-bin for visualizing examples

pa-bin/Cargo.toml

@@ -30,6 +30,7 @@ pa-vis.workspace = true
 [features]
 # Needed to correctly show pruned matches in visualizations.
 example = ["pa-heuristic/example", "astarpa2/example"]
+sdl = ["pa-vis/sdl"]
 default = []
 
 # A*PA figures