slisBNB mint clisBNB

Stake slisBNB and get clisBNB to participate in the Binance Lanchpool

PSM

1. Exchange between stablecoin and lisUSD
2. Purchase lisUSD with stablecoin and stake it to enjoy the profit of interest and token emission
3. Stake lisUSD to enjoy fixed interest profit

TimeLock

1. Add TimeLock contract with 1 day timelock
2. The upgrade role will be transferred to TimeLock

BNB Oracle: query price from resilientOracle

BNB Oracle will be upgraded with a minor change. Before the upgrade it queries the BNB prices from a single oracle source which is ChainLink. After the upgrade, it will query price from the resilient oracle which is more robust and this can avoid single point of failure.

Proxy: 0xf81748d12171De989A5Bbf2d76bf10BFbBaEC596
current implementation: 0x097c2c40a0deff531832a7fdbf1bbb0aa3315bc2

Upgraded slisBNB Oracle to Multi-Oracles

Upgraded slisBNBOracle, so it can query price from the ResilientOracle instead of a single source oracle.

AMO

This PR implement dynamic interest rate mechanism which calculate interest rate based on lisUSD price:

power = (peg - price) / beta
rate = rate0 * e^power

in which rate0 and beta are pre-defined value