Support Context through all the lifecycle of OpenSergoClient

[jnan806]

Issue Description

Type: feature request

Describe what feature you want

According to the characteristics of go language, We can control the all lifecycle of go-framwork by context.
And we need to integrate the context into OpenSergoClient, to make OpenSergoClient more flexible.

Through context, we can manage lifecycle unified by realizing:

• receive context from upstream framework, use the context in OpenSergoClient self.
• transfer context to downstream framework, do some special actions which OpenSergoClient owned before transfer

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根据 go 的特性， 我们可以通过 context上下文来控制 go框架的生命周期。这里，我们需要将context集成到 OpenSergoClient 中，从而使 OpenSergoClient 变得更加灵活。

通过contex上下文，我们可以实现以下两点来统一管理生命周期：

• 接收上游框架的context上下文, 将其集成到自身
• 在context中添加自己的信息以及操作，传递到下游框架

Additional context

The context need to manage lifecycle of OpenSergoClient and all goroutines OpenSergoClient created.

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context 需要统一管理 OpenSergoClient 以及 OpenSergoClient 创建的所有 goroutine