Support volumesnapshotcontent management in ks-console

Created by: f10atin9

What would you like to be added: Some pages in ks-console which can get volumesnapshotcontent information.

Please see this link for specific design: https://www.figma.com/file/8og5Ad5IX0qToDef9VO7bU/Storage?node-id=716%3A101662 Why is this needed: Currently ks-console only support volumesnapshot management, it does not support volumesnapshotcontent management (crud). volumesnapshot is like pvc while volumesnapshotcontent is like pv