feat: extend forest-cli chain head

[LesnyRumcajs]

Summary of changes

Changes introduced in this pull request:

• adds forest-cli chain head --tipsets [and -n] option, which allows for printing multiple last tipsets
• breaking change as I added epoch label

❯ forest-cli chain head
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❯ forest-cli chain head -n 5
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Reference issue to close (if applicable)

Closes

Other information and links

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation. All new code adheres to the team's documentation standards,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.

[hanabi1224]

It'd be great to support --format json (Not necessarily in this PR)

[LesnyRumcajs]

It'd be great to support --format json (Not necessarily in this PR)

Totally agree, not only for this subcommand but also for some others.

Added with low priority here #4954. It's nice to have, but so far, nobody needs it. And even in our CI, there was a single usage of it.

[LesnyRumcajs]

@hanabi1224 I removed the edge case in f5d1adb, it was an artefact from a different approach. with saturating_sub it's not needed.