feat: swap, zap and stake rewards

[sandybradley]

• Harvested rewards are swapped for weth
• 10% admin fee sent to mev protocol
• weth is zapped into LP
• LP is staked for increased staker share value

[jeremyHD]

harvest function would likely to be sandwiched. But it does happen to all harvest function on out there. The best we can do is to send via private pool

[sandybradley]

harvest function would likely to be sandwiched. But it does happen to all harvest function on out there. The best we can do is to send via private pool

Yeah, this is a risk worth noting for operations. Not sure what can be done about it at a solidity level as we are already using most liquid markets. On the plus side, in testing, the amounts of rewards aren't large enough to be sandwiched. Further, using gyro and curve v2 pools make sandwiching alot more difficult.