[ts][player] Add startRendering method to restart rendering, if it was stopped.

spine-ts/spine-player/src/Player.ts

@@ -936,6 +936,11 @@ export class SpinePlayer implements Disposable {
 		}
 	}
 
+	startRendering () {
+		this.stopRequestAnimationFrame = false;
+		requestAnimationFrame(() => this.drawFrame());
+	}
+
 	stopRendering () {
 		this.stopRequestAnimationFrame = true;
 	}