Refactor: Better routing for smoothstep and step edge (#2407)

* refactor(step/smoothstep-edge): better default routing
* chore(edges): pass options
* chore(exports): add BaseEdge

packages/core/src/index.ts

@@ -14,6 +14,7 @@ export {
   getSimpleBezierCenter as getSimpleBezierEdgeCenter,
 } from './components/Edges/SimpleBezierEdge';
 export { default as SmoothStepEdge, getSmoothStepPath } from './components/Edges/SmoothStepEdge';
+export { default as BaseEdge } from './components/Edges/BaseEdge';
 
 export { internalsSymbol, rectToBox, boxToRect, getBoundsOfRects } from './utils';
 export {