fix: handle missing optional dependency in declarations (#103)

Author: myandrienko

src/StreamVideoClient.ts

@@ -2,6 +2,8 @@ import { VideoApi } from './gen/video/VideoApi';
 import { StreamCall } from './StreamCall';
 import type { StreamClient } from './StreamClient';
 import type { ApiConfig } from './types';
+// eslint-disable-next-line @typescript-eslint/prefer-ts-expect-error
+/** @ts-ignore Optional dependency */
 import type {
   createRealtimeClient,
   RealtimeAPIModel,