MINOR: MetadataShell should handle ProducerIdsRecord

[dengziming]

More detailed description of your change
We store producer IDs in broker snapshots in #11527, I think we could also add the ability to inspect it using MetadataShell.

Summary of testing strategy (including rationale)
I tested this locally:

[ Kafka Metadata Shell ]
>> cat /producerIds/broker
1
>> cat /producerIds/blockStart
0
>> cat /producerIds/blockEnd
999
>> 

Committer Checklist (excluded from commit message)

• Verify design and implementation
• Verify test coverage and CI build status
• Verify documentation (including upgrade notes)

[dengziming]

Hi, @cmccabe , this is a minor improvement similar to your PR #11527. PTAL.

[dengziming]

This change makes the MetadataShell generate the same output as what we get from zookeeper path "/latest_producer_id_block" added in #10504. ping @mumrah to have a look.

[hachikuji]

Thanks for the patch. Left a couple suggestions for consideration.

[hachikuji]

LGTM. Thanks for the patch!