[improve] [broker] add role for consumer stat

[thetumbled]

Motivation

By config allowAutoSubscriptionCreation, we allow uses to create subscriptions automatically if user have the consume permission. We have a strong need to trace back who is the owner of a specific subscription, but currently there is no such way to achieve that.

Modifications

Add field role in the stats response.

Verifying this change

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This change added tests and can be verified as follows:

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• Added integration tests for end-to-end deployment with large payloads (10MB)
• Extended integration test for recovery after broker failure

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

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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

Documentation

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