feat:splitstore:Badger GC of hotstore command

[ZenGround0]

Related Issues

#10386

Proposed Changes

chain prune hot implements badger online GC of hotstore in user driven way

Additional Info

In addition to making the new feature this PR:

• Limits total number of flatten workers to 7 as the conclusion of investigation started in Remove flatten #10353
• Respects context during garbage collection to allow for better shutdown behavior for very low GC thresholds
• Rename existing chain prune to chain prune compact-cold to make name more descriptive

Unsure about

• I bumped lotus api version number, not sure if that's correct

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

[magik6k]

Splistore-related changes look good.

API version really shouldn't be bumped unless really necessary.