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/impls/idb/v1/db.ts

@@ -28,7 +28,7 @@ export class DocIDBConnection extends Connection<IDBPDatabase<DocDBSchema>> {
     });
   }
 
-  override async doDisconnect(conn: IDBPDatabase<DocDBSchema>) {
+  override doDisconnect(conn: IDBPDatabase<DocDBSchema>) {
     conn.close();
   }
 }
@@ -57,7 +57,7 @@ export class BlobIDBConnection extends Connection<IDBPDatabase<BlobDBSchema>> {
     });
   }
 
-  override async doDisconnect(conn: IDBPDatabase<BlobDBSchema>) {
+  override doDisconnect(conn: IDBPDatabase<BlobDBSchema>) {
     conn.close();
   }
 }