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/utils/index.ts

@@ -42,3 +42,6 @@ export const getBoundsofRects = (rect1: Rect, rect2: Rect): Rect =>
 export const isNumeric = (n: any): n is number => !isNaN(n) && isFinite(n);
 
 export const internalsSymbol = Symbol('internals');
+
+// used for a11y key board controls for nodes and edges
+export const elementSelectionKeys = ['Enter', ' ', 'Escape'];