[improve][broker] Add methods for batch updating and deleting bookie rack information

[hrzzzz]

Motivation

We can add admin APIs for batch updating or deleting bookie rack info to reduce write operations to ZooKeeper.

Modifications

Add admin APIs:

• batchDeleteBookiesRackInfo
• batchUpdateBookiesRackInfo

Verifying this change

• Make sure that the change passes the CI checks.

Added tests:

• org.apache.pulsar.broker.admin.BookiesApiTest#testUpdateBookieRackInfo
• org.apache.pulsar.broker.admin.BookiesApiTest#testDeleteBookieRackInfo
• org.apache.pulsar.broker.admin.BookiesApiTest#testClearAllBookiesRackInfo

Does this pull request potentially affect one of the following parts:

If the box was checked, please highlight the changes

• Dependencies (add or upgrade a dependency)
• The public API
• The schema
• The default values of configurations
• The threading model
• The binary protocol
• The REST endpoints
• The admin CLI options
• The metrics
• Anything that affects deployment

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

Matching PR in forked repository

PR in forked repository: hrzzzz#6