refactor(core): [CORE-23] complete keyboard controls and focus lifecycle

packages/artplayer/src/accessibility/keyboard.ts

@@ -0,0 +1,14 @@
+const handled = new WeakSet<KeyboardEvent>()
+
+export function claimKey(event: KeyboardEvent): void {
+  handled.add(event)
+  event.preventDefault()
+}
+
+export function isClaimedKey(event: KeyboardEvent): boolean {
+  return handled.has(event)
+}
+
+export function plainKey(event: KeyboardEvent): boolean {
+  return !event.altKey && !event.ctrlKey && !event.metaKey && !event.isComposing && event.keyCode !== 229
+}