xBRRR staking program

[miaojiang]

• [x] #241
• [x] Decide log base for boost rewards calculation
• [x] Display estimated APY based on users' booster multiplier and token prices
• [ ] DAO proposal to unlock BRRR
• [ ] Docs on staking and booster
• [ ] User guide?
• [ ] Announcement (Medium + Twitter)
• [ ] Update farm to distribute BRRR
• [ ] Test storage issue in testnet
• [ ] #341
• [ ] Change logbase on Mainnet to 100
• [ ] wNEAR rewards
• [ ] Deploy the UX

[miaojiang]

Need formula for new APY computation

[miaojiang]

@evgenykuzyakov to review latest PR, especially around APY calculation