Merge pull request didi#14 from HRX980829/master

 Fix cross-language seqId problem

Merge pull request didi#13 from lvan100/master

修复 thrift 数据拆包然后 sharingan 读不全的问题

Merge pull request didi#12 from HRX980829/master

Support extended fields

new dir koala

update replayer md for grpc

update doc for support fastcgi

fix adding header for thrift inbound request in case of too large one

fix http&thrift request when adding header

update app.toml

update doc for replayer-agent binary