[improve][cli]New tests for operations on namespaces in pulsar-client-tools

[sandeep-mst]

Fixes 21743 of apache/pulsar

Motivation

Pulsar client tools doesn't have tests for listing, deleting and creating namespaces through Pulsar-admin.

Modifications

Modified TestCmdNamespaces.java and added tests for listing, creating and deleting namespaces. These tests test with V2 namespace convention.

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• 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

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