feat: partition main canvas vertically (#6759)

Co-authored-by: Marcel Mraz <marcel.mraz@adacta-fintech.com>
Co-authored-by: dwelle <luzar.david@gmail.com>

src/element/binding.ts

@@ -474,6 +474,7 @@ const maybeCalculateNewGapWhenScaling = (
   return { elementId, gap: newGap, focus };
 };
 
+// TODO: this is a bottleneck, optimise
 export const getEligibleElementsForBinding = (
   elements: NonDeleted<ExcalidrawElement>[],
 ): SuggestedBinding[] => {