[FEATURE REQ] Support customizing the EventHubsProducerFactory and EventHubsProcessorFactory

[moarychan]

Is your feature request related to a problem? Please describe.
The same customization of Service Bus is also necessary for Event Hubs, see more from AzureServiceBusMessagingAutoConfiguration.

Describe the solution you'd like
Support the customizer, token according to DefaultEventHubsNamespaceProcessorFactory and DefaultEventHubsNamespaceProducerFactory.

Describe alternatives you've considered
N/A

Additional context
Similar scenario may be covered, see from #44414

Information Checklist
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• Description Added
• Expected solution specified

[github-actions]

@anuchandy @conniey @lmolkova

[github-actions]

Thank you for your feedback. Tagging and routing to the team member best able to assist.