Mr Melon issues

Results 4 issues of


                                            Mr Melon

### Issues associated with this PR Pipebuffer performance is low，change to Bufferchain to improve throughput

kind/feature

nacos k8s部署，想给istio提供mcp，请问如何修改配置文件

var A = &a{} type a struct{ ....... } 这样不就是singleton了吗？有什么缺陷吗

Bufferchain is added for http2 stream and Iobuffer is implemented