RPL Staking Rework (RPIP-30)

This vote aims to align RPL reward spend with rETH capacity created. ### Summary - RPL rewards will scale differently, with a focus on aligning RPL rewards with supplying rETH - It will be possible to withdraw down to 15% borrowed ETH (this threshold is currently 150% of bonded ETH) - We will transition to the new states over time (some implementation time, six reward periods of ramping, and fully implementing the withdrawal changes will need a smart contract release) - Withdrawing will become a 2-step process where RPL is set to "withdrawing" for 28 days before it can be withdrawn ### Rationale The goal is to align the DAO's spending on RPL rewards with the DAO's goals. In particular, we'll continue to send 70% of inflation to Node Operators, but better align it far more with the amount of minted rETH. _Please_ read the Intro document's [context section](https://github.com/Valdorff/rp-thoughts/tree/main/rpl_staking#context) for a visual representation of spending before and after this change. ### Outcomes if vote passes - RPL rewards will scale differently - Adding a minipool will increase RPL rewards (even if you already had enough staked RPL) - Converting an EB16 to two LEB8s will increase rewards (even if you already had enough staked RPL) - You will still need staked RPL value of ≥10% borrowed ETH to get RPL rewards [unchanged] - Staking more RPL will mean more rewards [unchanged], though now without a maximum (note that marginal APR gets lower and lower as more is staked) - Beyond 15% borrowed ETH, additional rewards go up slower and slower - The rewards changes will be phased in slowly over 6 months - It will be possible to withdraw down to 15% borrowed ETH - RPL withdrawal will become a 2-step process - Set X RPL to "withdrawing"; these RPL are no longer eligible for rewards or voting - After 28 days, the RPL may be withdrawn - The new rules will be partially phased in over time, and then fully implemented with the next smart contract release - Note that this will apply to all withdrawals, even ones that would currently be instant - Note that this will not apply to claiming rewards, as that isn't a withdrawal - Once the 2-step process is implemented, the current "28-day withdrawal lock when you stake RPL" will be removed - These changes will apply equally to both existing and new NOs ### Context - Intro document [live on Val's rp-thoughts repo](https://github.com/Valdorff/rp-thoughts/tree/main/rpl_staking) or [archived printout in RPIP repo](https://github.com/rocket-pool/RPIPs/blob/main/assets/rpip-30/rpl_staking_readme.pdf) - [Forum thread](https://dao.rocketpool.net/t/rpl-staking-rework-proposal/2090) - [Full RPIP](https://github.com/rocket-pool/RPIPs/blob/main/RPIPs/RPIP-30.md) - [Deep dive links](https://github.com/Valdorff/rp-thoughts/tree/main/rpl_staking#what-else-has-been-looked-at-around-this-proposal) (a section within the intro document)