Ftr: delete session.handleLoop (#56)

Ftr: delete session.handleLoop (#56)

* delete session.handleLoop

* fix error codes

* fix unit test

* feat: benckmark

* feat: 添加压测程序

* feat: remove no need info

* feat: del exec file

* feat: fix client's session

* feat: update gomod

* feat: fix imports

* feat: update gomod

* feat: change sessionTimerLoop to heartbeat

* feat: go fmt

* feat: update benchmark client send message

* feat: remove loop_client unreachable code

* increase grNum before starting goroutine

* feat: format

* feat: add dubbo-getty alias

* feat: fix gettyUDPConn recv err

Co-authored-by: watermelon <80680489@qq.com>
Co-authored-by: georgehao <haohongfan@gmail.com>
Co-authored-by: wangoo <wongoo@apache.org>