add some features、fix bugs、fix coverity problems

[wgs13579]

1. 【Feature】support encryption zone and replica
2. 【Feature】support pieceInfo
3. 【Feature】support client_ip cross obproxy to observer
4. 【Feature】optimize timeout of anonymous block
5. 【Feature】support temporary_table route variable
6. 【Feature】Compatible with connector/j bugs
7. 【Bugfix】fix sharding connect failed when enable_proxy_scramble=true
8. 【Bugfix】Fix the problem that ODP
9. 【Bugfix】Fix the problem of PS Cursor Hang when not compressed
10. 【Bugfix】fix coverity bug

[CLAassistant]

All committers have signed the CLA.