Feature Request: Add a private proto `knp` for Knetty

[sunbinnnnn]

Background:
Many of networking library support private net proto, private proto can be secure and can support delicate flow control.

How to do:
Extened basic TCP with some flow control and secure encryt, first version just for demo and add some example application to use it.

[Softwarekang]

good suggestion

we plan to create a new repository to implement a more performant, universal protocol such as QUIC to address the limitations of TCP and UDP, resulting in improved performance for Knetty.