Bilibili Discovery Versions Save

• fix replication set
• update grpc to v1.29.1
• update kratos to v0.6.0

1. fix no LatestTimestamp when register
2. fix param split bug
3. update go mod

1. fix initproject abort

1. use kratos pkg
2. replace gin by kratos/bm
3. fix poll return nil when be canceled.
4. add init protect mode
5. supoort set.

1. rename import path

Changelog

1. discovery register&polls&replica
2. self-discovering nodes
3. metadata updates
4. naming client & grpc resolver