In this version, we bring some minor features and code polish to the project:

1. Support username/password authentication usage: https://github.com/nacos-group/nacos-sdk-cpp/blob/master/README.md#enabling-authentication (en_US) https://github.com/nacos-group/nacos-sdk-cpp/blob/master/README_zh_CN.md#%E5%90%AF%E7%94%A8%E8%AE%A4%E8%AF%81 (zh_CN)
2. Support local disk cache when the network become temporarily unavailable

Code polish: Refactor the construction/deconstruction process to separate file to keep maintainability Deconstruction process is refactored to ObjectConfigData, a destroy proxy