fix: improve type inference for $in filter in queryChannels (#1663)

Improves the type inference for the `$in` operator in `queryChannels()` filters.
Fixes: #1661.

Array types weren't properly unpacked, so TS types required nested arrays:
```ts
const channels = await this.streamChat.queryChannels({
   filter_tags: { $in: [`my_tag`] }, // errors
   filter_tags: { $in: [[`my_tag`]]` }, // doesn't error on TS but our API expects a flat array
});
```

Author: oliverlaz

src/types.ts

@@ -2029,7 +2029,7 @@ export type QueryFilter<ObjectType = string> =
     : {
         $eq?: PrimitiveFilter<ObjectType>;
         $exists?: boolean;
-        $in?: PrimitiveFilter<ObjectType>[];
+        $in?: PrimitiveFilter<Unpacked<ObjectType>>[];
       };
 
 export type QueryFilters<Operators = {}> = {