Benchmark frame serialization

[dkropachev]

Modify an API so that it is possible to hook to Write(p []byte) (n int, err error) and Read(p []byte) (n int, err error) of the conn net.Conn from Conn:

type Conn struct {
	conn net.Conn

Enabling recording and mocking single Connection flow.
Using new API, record a traffic for select, and insert for small, medium and big dataset.
Using recorded traffic implement single connection benchmark tests for given cases.