Support multiple snapshotclass in console when taking snapshot

Created by: f10atin9

What would you like to be added: Just like the storageclass, user might want to create multiple different snapshotclass and take snapshot by each. So we need to support this scenario in console. Maybe just adding a dropdown list to choose the different snapshotclass. Why is this needed: Currently ks-controller will create a snapshotcalss for each storageclass with the same name, and the snapshotclass will be used when user takes snapshot in console.

The problem is the default snapshotclass ks-console generated might not work.