SetReadDeadline (an alternative to deadline contexts)

Hey,

For the continuous reads, it's convenient to use something like Gorilla's SetReadDeadline, instead of creating a new context each time a Read is called. Though I know Gorilla's encapsulating the net.Conn, while this pkg isn't. How do you think is it possible to add something like that in this library?

Start by reviewing the library's continuous-read and Read context handling, then compare it with Gorilla's SetReadDeadline and the package's relationship to net.Conn. Define whether an equivalent API is feasible without exposing net.Conn, including its deadline semantics and how completion would be verified.

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