SDK: allow indexR address to be passed to swap and simulate

`INDEX_R: this.getIndexR(TOKEN_R)`

INDEX_R is the Uniswap v3 pool address of the TOKEN_R (reserve token) and a stablecoin (USDC, USDT), it is passed to the `swap` tx to track the reserve price for historical data.

`getIndexR` try to find the pool in the whitelisted routes, which usually don't have all unpopular token. So it's best to allow client to pass the indexR (bytes32) in.