Replace InternalReset/DeleteStuff with ResetPods/NonPods & Save protocol-param in thrift_method_name which is rarely used

* Delete trailer map
* Convert H2Error and grpc error to ErrorCode

* add grpc sanity and exception UT

* client can receive grpc error code and message
* add percent encode/decode

* Add grpc-message

- Set stream creator in serialize_request

TODO: 1. socket management 2. window mechanism