HTTP2 support for thrift go client

[wenhaocs]

Hi, can I check if thrift go client has HTTP2 support or do you have plans for that? Thanks!

[veezhang]

I've tried with HTTP2, and it's failed at seqID check. The seqID is always 0 in RecvMsg.

https://github.com/facebook/fbthrift/blob/main/thrift/lib/go/thrift/clientconn.go#L103-L116