feat: improve dataobj-inspect command

[grobinson-grafana]

This commit improves the dataobj-inspect command to have two sub-commands:

dump: Dumps the contents of each data object in file.
stats: Prints stats for each data object in file.

Here is an example of how it looks:

Streams section:
        offset: 0, columns: 8, compressed size: 219 B; uncompressed size 171 B
                STREAM_ID[]; 1 populated rows; 4 B compressed (NONE); 4 B uncompressed
                MIN_TIMESTAMP[]; 1 populated rows; 13 B compressed (NONE); 13 B uncompressed
                MAX_TIMESTAMP[]; 1 populated rows; 13 B compressed (NONE); 13 B uncompressed
                ROWS[]; 1 populated rows; 4 B compressed (NONE); 4 B uncompressed
                UNCOMPRESSED_SIZE[]; 0 populated rows; 3 B compressed (NONE); 3 B uncompressed
                LABEL[__end__]; 1 populated rows; 39 B compressed (ZSTD); 23 B uncompressed
                LABEL[__path__]; 1 populated rows; 104 B compressed (ZSTD); 88 B uncompressed
                LABEL[__start__]; 1 populated rows; 39 B compressed (ZSTD); 23 B uncompressed
Logs section:
        offset: 1, columns: 3, compressed size: 20 B; uncompressed size 20 B
                STREAM_ID[]; 1 populated rows; 4 B compressed (NONE); 4 B uncompressed
                TIMESTAMP[]; 1 populated rows; 13 B compressed (NONE); 13 B uncompressed
                MESSAGE[]; 0 populated rows; 3 B compressed (ZSTD); 3 B uncompressed

What this PR does / why we need it:

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
• 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

[benclive]

Nice! I'm happy to approve after the reader conditions are fixed. Thanks for implementing!

Another thought: It's not a blocker since this cmd is for debugging and I haven't actually used it myself, but the print streams command feels like it should be a stream-id filter on the dump command instead

[benclive]

Do we have the section metadata from sec? It might be nice to print "unknown section: X" instead of exiting completely on the first unknown section

[benclive]

LGTM apart from one reader's if statement. Approving to unblock though.