feat: api/cli: change beneficiary propose and confirm for actors and multisigs.

[geoff-vball]

Related Issues

Closes #9254 and #9253

Proposed Changes

Additional Info

Checklist

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

• All commits have a clear commit message.
• The 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, INTERFACE BREAKING CHANGE, CONSENSUS BREAKING, build, chore, ci, docs,perf, refactor, revert, style, test
  • area: api, chain, state, vm, data transfer, market, mempool, message, block production, multisig, networking, paychan, proving, sealing, wallet, deps
• This PR has tests for new functionality or change in behaviour
• If new user-facing features are introduced, clear usage guidelines and / or documentation updates should be included in https://lotus.filecoin.io or Discussion Tutorials.
• CI is green

[geoff-vball]

@arajasek This is generally ready for review, but something in the storage miner API seems to have broken a bunch of tests. Was this the kind of thing we have to go into docgen.go for?

[arajasek]

Some notes (a lot of the comments left on the first command apply to the subsequent commands too, so please apply those changes across all 4 commands).

[arajasek]

Couple nits, but g2g once they're addressed