chore: Update nwaku RLN contract registration tools

[stubbsta]

Background

A new RLN contract has been deployed to Linea Sepolia testnet (see waku-org/pm#228 and waku-org/pm#258). This requires updates to the nwaku repo. This work is dependent on updating the contract address covered by this issue #3190
The milestone for this is waku-org/pm#228

Details

The new contract has multiple new functions including a different registration mechanism.
The registration tools need to be updated to allow user-specified rate limits.
The new contract functionality also needs to be implemented.