feat: shed: Add beneficiary commands

[rjan90]

Proposed Changes

Adding the ProposeChangeBeneficiary and ConfirmChangeBeneficiary commands to lotus-shed.

Having these commands in the lotus-shed makes it possible to propose and confirm beneficiary address changes without the need to import the keys into the lotus-node that the lotus-miner is connected to.

Checklist

Before you mark the PR ready for review, please make sure that:

• Commits have a clear commit message.
• PR title is in the form of of <PR type>: <area>: <change being made>
  • example: fix: mempool: Introduce a cache for valid signatures
  • PR type: fix, feat, build, chore, ci, docs, perf, refactor, revert, style, test
  • area, e.g. api, chain, state, market, mempool, multisig, networking, paych, proving, sealing, wallet, deps
• New features have usage guidelines and / or documentation updates in
  • Lotus Documentation
  • Discussion Tutorials
• Tests exist for new functionality or change in behavior
• CI is green

[jennijuju]

o propose and confirm beneficiary address changes without the need to import the keys into the lotus-node that the lotus-miner is connected to

cuious why is this something user would want?

[rjan90]

cuious why is this something user would want?

• Owner and beneficiary address might be different entities/(potentially a smart contract)
• Owner-addresses and beneficiary-addresses are usually not held on the lotus daemon that the lotus-miner is connected to for security reasons.