message: add ShardManager#ping for average ping
diff: @@ -26,6 +26,14 @@ export class ShardManager extends HarmonyEventEmitter<ShardManagerEvents> {
  return this.client.rest
  }
  + /** Get average ping from all Shards */
  + get ping(): number {
  + return (
  + // eslint-disable-next-line @typescript-eslint/restrict-plus-operands
  + this.list.map((e) => e.ping).reduce((p, a) => p + a, 0) / this.list.size
  + )
  + }
  +
  constructor(client: Client) {
  super()
  this.client = client
  