Add wallet integration

• Process stash and controller rewards.
• Save stash validator information data.
• Update validator slash and reward logic based on new Polkadot API.

Process rewards, slash, point data based on new polkadot API

• Process rewards by each era
• Process slash by each era
• Process point by each era
• Fix inflation rate

Update validator identity

• Update validator identity
• To upgrade to v0.1.1, need to run sql\v0.1.1.sql to update DDL.

Process node data

• Process block event by block header
• Subscribe block event
• Save reward data
• Save slash data
• Save author data
• Save token data
• Save validator data