UMIP 22-Add GASETH-TWAP-1Mx1M as a supported DVM price identifier

This UMIP will reference a synthetic token to be created with this price identifier. This token will be referred to as ‘uGAS’ and will represent the token that tracks this identifier with the most ETH volume on Uniswap unless a different contract is determined by voters to be more legitimate.

The DVM should support requests for a price that resolves to either the median monthly Ethereum gas price or a 2-hour Time-Weighted Average Price (TWAP) on the highest volume Uniswap ETH/uGAS pool. The price resolution method to use will depend on the the timestamp the price request was made at.

For a price request made at or after the Unix timestamp 1625097600 (Jul 01, 2021 00:00:00 UTC), the price will be resolved with the median monthly gas price calculation defined for GASETH-1M-1M in UMIP-20.

For a price request made before 1625097600 , the price will be resolved to a 2-hour TWAP for the Uniswap price of the listed synthetic token in ETH. The synthetic token address will be listed in the Technical Specification section.