chore: add v4 chunk format to chunks-inspect tool

[slim-bean]

What this PR does / why we need it:

The chunks-inspect tool was never updated to parse the newer v4 chunk with structured metadata, this PR fixes that

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Checklist

• Reviewed the CONTRIBUTING.md guide (required)
• Documentation added
• Tests updated
• Title matches the required conventional commits format, see here
  • Note that Promtail is considered to be feature complete, and future development for logs collection will be in Grafana Alloy. As such, feat PRs are unlikely to be accepted unless a case can be made for the feature actually being a bug fix to existing behavior.
• Changes that require user attention or interaction to upgrade are documented in docs/sources/setup/upgrade/_index.md
• For Helm chart changes bump the Helm chart version in production/helm/loki/Chart.yaml and update production/helm/loki/CHANGELOG.md and production/helm/loki/README.md. Example PR
• If the change is deprecating or removing a configuration option, update the deprecated-config.yaml and deleted-config.yaml files respectively in the tools/deprecated-config-checker directory. Example PR

[agebhar1]

Did the same in #11506.

[cstyan]

@agebhar1's PR is merged so I'm going to close this

[slim-bean]

re-opening this PR after reverting the other implementation, it's preferable that this tool does not import any Loki code to decompress chunks, rather it's able to do so by implementing the chunk format directly