[client-v2] Implement adoption of old configuration parameters.

Client V2 has removed (deprecated) some V1 configuration parameters. That was done to simplify and remove redundant configuration, and some parameters were renamed for better readability. However, users may struggle with migration because they have to re-implement client configuration in their applications. Client V2 should have a friendly interface:
- It should accept renamed parameters.
- Deprecated parameters may be present for some time.
- Configuration migration guide should be written.

定位 Client V2 的配置入口，并将其与已移除或重命名的 V1 参数进行比较。定义重命名参数和已弃用参数的兼容行为，然后编写配置迁移指南。当现有配置可以通过友好界面完成迁移，并且指南解释了所需的更改时，即视为完成。

由索引模型根据 Issue 内容生成。