Refactor storage system

[olivershen-wow]

• Abstract interface StorageServiceClient for generalized storage implementation use;
• Refactor all usage of BlobStorageClient.java to StorageServiceClient.java;
• Add StorageManageService for StorageServiceClient init control;
• Enable fastjson auto type support for all entity classes under common/entity/common package, move classes that would be used in Websocket communication to common/entity/common;
• Modify CDNUrl usage in StorageFileInfo, from CDN endpoint to absolute CDN URL;
• Gradle plugin compatibility;
• Tested in plugin and frontend;
• Fix UT for modified classes;
• Refactor entity class BlobFileInfo to StorageFileInfo;

Storage system class UML design diagram:

Storage system run sequence diagram:

TODO:

• Local storage support;
• Update README with latest storage config in Docker images