Support Azure Managed Identity for Azure Event Hubs event-source

[pauldotyu]

Is your feature request related to a problem? Please describe.
Azure EventHubs event source currently supports key-based authentication only. When deploying Azure EventHubs with local authentication disabled, which is a security best practice, there is no way to configure the event source to use Microsoft Entra Workload Identity. This event source should support service principal authentication similar to Azure ServiceBus event source

Describe the solution you'd like
The Azure EventHubs event source should be refactored to work similarly to Azure ServiceBus event source.

Describe alternatives you've considered
Alternative is to leave as-is and not support workload identity.

Additional context
As part of this refactoring, the SDK for event hubs needs to be updated from deprecated azure-event-hubs-go to current azure-sdk-for-go/sdk/messaging/azeventhubs.

Also wanted to note that I'd be happy to contribute a PR for this.

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