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