feat(nbstore): remove async on connection api (#9187)

We should not use async on `connect` and `disconnect`, for `WebSocketConnection` will never connect when offline.

We should handle the connection status of each storage in sync, using the `connection.waitForConnect`

This PR also puts the connection reference count on the `connect` and disconnect`

packages/common/nbstore/src/connection/shared-connection.ts

@@ -11,12 +11,10 @@ export function share<T extends Connection<any>>(conn: T): T {
   const existing = CONNECTIONS.get(conn.shareId);
 
   if (existing) {
-    existing.ref();
     return existing as T;
   }
 
   CONNECTIONS.set(conn.shareId, conn);
-  conn.ref();
 
   return conn;
 }