[Improvement]

### What would you like to be improved?

now I want to use GravitinoVirtureFileSystem to manager catalog,but because GravitinoVirtureFileSystem extend Filesystem,I want to use some of the features of DistribututedFileSystem, such as setting storage policies, which are not available in GravitinoVirtureFileSystem. Can GravitinoVirtureFileSystem implement these methods？
`
DistributedFileSystem dfs；
dfs.setStoragePolicy(dirPath, hdfsPolicy.getPolicy());
`

### How should we improve?

Choose to inherit the fileSystem or the DistrubutedFilesystem or add a method to distinguish the file system in GravitinoVirtureFileSystem

Start by locating GravitinoVirtureFileSystem and reviewing how it relates to Filesystem and DistributedFileSystem. Compare the available DistributedFileSystem features, including setStoragePolicy, with the methods exposed by GravitinoVirtureFileSystem. Done means the supported inheritance or delegation approach is decided and the requested storage-policy capability is covered.

Written by the indexing model from the issue text.