[Pool Request] Add SWRV/ETH LP Pool

Swerve Finance (https://swerve.fi/) is a 100% community-owned fork of Curve with fairer tokenomics for Liquidity Providers, and a max supply of 33M SWRV. More details can be found on the website.

SWRV Contract Address: 0xb8baa0e4287890a5f79863ab62b7f175cecbd433

As of now, they have $492M+ locked in the protocol.

This proposal seeks to add SWRV-ETH LP pool which would help create more liquidity for SWRV-ETH pool and reward LPs with the same initial reward weight of 0.2x as was assigned for the Pools added in SIP-4.