Add a skeleton while the storage request is processing

[2-towns]

When a storage request is processing, it can take some time depending on the size of the file.

To avoid making the user wait during the processing time, we will create a skeleton row in the availability list until the request is completed. After the request is done, the skeleton will be replaced by the storage request result information.

Note: We may consider using a worker to process the request independently of the component's lifecycle. Because if the component is unmounted (for example, if the user clicks on another page), the request could be canceled.

This issue is currently blocked by the thread issue in the client node because, while the request is processing, the user will not be able to see the availability list until the storage request is complete.