feat: spcli: sectors extend improvements

[magik6k]

Related Issues

On top of the sptool refactor - #11788

Proposed Changes

• Add client/piece info to the skip-claim log in the sectors extend command
• (Also make sector info epochs print with human-readable time)
• Simulate message execution without --really-do-it
• Fix a bug where sectors with too-short-term-max claims wouldn't be correctly skipped

Additional Info

Example output:

skipping sector 6176 because claim 19991937 (client 2097088, piece baga6ea4seaqetclihltz5l75tov5nt5sftfcal7nxbpnbt6whxpjhg63adg5yga) does not live long enough 
skipping sector 6177 because claim 19991939 (client 2097088, piece baga6ea4seaqpwwhak6s4umsywzpkrlpy5wi6vvlheuotdbr34doiu5qpd6gx4lq) does not live long enough 
skipping sector 6178 because claim 19991940 (client 2097088, piece baga6ea4seaqocgv36nivk3pthd4i4qmtx2aefcn76tf5f4stirzck2b7pj5m4ay) does not live long enough 

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
• If the PR affects users (e.g., new feature, bug fix, system requirements change), update the CHANGELOG.md and add details to the UNRELEASED section.
• 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

[snadrus]

rebase needed? @magik6k