fix(typings): fix the type of the "query" option (#1439)

Having type `Object` it was not possible to set values, e.g.:

```ts
if (!this.socket.io.opts.query) {
  this.socket.io.opts.query = {};
}
this.socket.io.opts.query.token = 'abc123';
```

Results in error:

> Element implicitly has an 'any' type because expression of type '"token"' can't be used to index type 'Object'.

lib/index.ts

@@ -67,7 +67,7 @@ function lookup(
     io = cache[id];
   }
   if (parsed.query && !opts.query) {
-    opts.query = parsed.query;
+    opts.query = parsed.queryKey;
   }
   return io.socket(parsed.path, opts);
 }

lib/manager.ts

@@ -32,7 +32,7 @@ interface EngineOptions {
   /**
    * Any query parameters in our uri. Set from the URI passed when connecting
    */
-  query: Object;
+  query: { [key: string]: string };
 
   /**
    * `http.Agent` to use, defaults to `false` (NodeJS only)

lib/url.ts

@@ -18,7 +18,7 @@ type ParsedUrl = {
   query: string;
   anchor: string;
   pathNames: Array<string>;
-  queryKey: Record<string, string>;
+  queryKey: { [key: string]: string };
 
   // Custom properties (not native to parseuri):
   id: string;