Implement <group subcircuit routeCache={...} />

[seveibar]

• Introduce RouteCache definition inside props, similar to manualEdits
• Implement pulling pcb traces from route cache (NOTE: the ids won't be the same on subsequent renders! the route cache must use a selector instead of ids like manualEdits!)
• Implement function that converts circuit-json pcb_traces into a route cache (maybe this can be a separate export of props? unclear what module- but I lean towards props as an optional/secondary export)