Add configuration support for OpenSergoClient

[sczyh30]

Add configuration support for OpenSergoClient so that users could configure TLS, retry, timeout and others.

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OpenSergoClient 支持自定义配置（如 TLS、重试配置、超时配置等）。API 范式可以是普通的带 config 构造的方式，也可以是 builder 方式 (OpenSergoClientBuilder)。