Feat: basic keyboard controls and better WAI-ARIA defaults (#2333)

* feat(nodes): focusable and moveable with keys
* refactor(key-handling): cleanup, handle selections
* feat(edges): selectable with keys
* refactor(nodes-edges): cleanup keyboard controls and aria- attrs
* refactor(nodes): node needs to be selected for arrow keys
* refactor(minimap): create const for labelledby

closes #1033

packages/core/src/components/Attribution/index.tsx

@@ -22,7 +22,7 @@ function Attribution({ proOptions, position = 'bottom-right' }: AttributionProps
       className={cc(['react-flow__attribution', ...positionClasses])}
       data-message="Please only hide this attribution when you are subscribed to React Flow Pro: https://pro.reactflow.dev/pricing"
     >
-      <a href="https://reactflow.dev" target="_blank" rel="noopener noreferrer">
+      <a href="https://reactflow.dev" target="_blank" rel="noopener noreferrer" aria-label="React Flow attribution">
         React Flow
       </a>
     </div>