Add ReadLimit to Option structs

还没有人认领这个 Issue。

Would it be possible to add a field to `AcceptOptions` and to `DialOptions` that sets the read limit on the created connection? It's not as convenient to have to call the `SetReadLimit()`. If the field is 0 then a default limit can be applied.

Is there a need to change the limit dynamically? I mean, why is it a method (i.e. can be called multiple times) vs a field in those option setting structs?

首先定位 AcceptOptions 和 DialOptions 的定义以及 SetReadLimit 方法，然后追踪每个选项如何创建连接。确定零值字段应如何与默认限制交互，以及该方法是否必须继续可用于动态更改。完成标准是：两个选项结构体都可以配置初始读取限制，同时不移除该方法现有的行为。

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