feat: add bancorv3

[tonzgao]

Description

add bancorv3

fyi not a dev for this project

Checklist

• I have followed the Contributing Guidelines
• (optional) As a contributor, my Ethereum address/ENS is: what is this for, is it for tips or airdrops or something?

How to test?

contract and deposits found here https://etherscan.io/address/0xb0B958398ABB0b5DB4ce4d7598Fb868f5A00f372
docs: https://docs.bancor.network/developer-guides/read-functions/rewards

[immasandwich]

Hello @tonzgao ! Noticed a few things:

1. We should have a bancor.pool.token-fetcher.ts to represent the pool token deposits (like bnBNT, bnDAI, etc). The pricrPerShare for these tokens can be derived from https://etherscan.io/address/0xec9596e0eb67228d61a12cfdb4b3608281f261b3#readContract

2. Then, you’ll see that the deposits to the StandardRewards contracts are actually these tokens (i.e: the user has a bnDAI deposit in the StandardRewards contract)

[immasandwich]

Few more small things but I think we’re really close to being done now!

[immasandwich]

If possible, please split the group to “v3Pool” and “v3Farm” as well (this enables us to do TVL calculation in the future very easily)

[immasandwich]

Sorry I just realized I didn’t submit a few comments 😅