* 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

the responsibility of stream_data and stream_creator more clearer

TODO: 1. socket management 2. window mechanism

1.Flush previous component when beginning and ending quotes; 2.Escape quote symbols in quoted contents; 3.Quote backslash and doublequote when printing redis messages; 4.Print better logs for unmatched quotes