Apache Pulsar as an ISB Service

[whynowy]

Summary

Implement Apache Pulsar as an ISB Service - do not need to support built-in installation, but external service configuration is good enough.

• [ ] #1451
• [ ] InterStepBufferService spec change to support Pulsar
• [ ] K/V store implementation
• [ ] Implement Pulsar ISBService interface for ISB and bucket management
• [ ] Pulsar ISB Reader/Writer

Use Cases

When would you use this?

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