[Task] tcp proxy integrated test and e2e test

[moremind]

Description

now, TCP proxy plugin is finished, but the plugin lacks some test cases including the integrated test and e2e test.T

Task List

1. TCP proxy plugin integrated test
2. TCP proxy plugin e2e test

[eurecalulu]

I think this is a very meaningful task and I am very willing to try it. Please assign it to me～

[TulanCN]

Is this task already finished? If not, I'd like to help.