Event Hubs SDK: Adding connection string support for AAD Managed Identity

[serkantkaraca]

• Adding connection string support for AAD Managed Identity
• Removing dependency on ADAL

[bainian12345]

        var tenantId = "";

Doesn't look like this is needed

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Refers to: sdk/eventhub/Microsoft.Azure.EventHubs/tests/Client/TokenProviderTests.cs:117 in 20420b8. [](commit_id = 20420b8, deletion_comment = False)

[devigned]

<3 the use of the ITokenProvider! I approve.

@schaabs, do you have any guidance to impart for future Azure.Identity integration?

[schaabs]

We discussed this last week. The callback pattern that they are using here aligns well with future plans for azure identity.

[jsquire]

There were a couple of minor suggestions that I left, but otherwise, things look good to me.

[jsquire]

nit: If this won't be populated, better to remove it to reduce noise.

[jsquire]

nit: If this won't be populated, better to remove it to reduce noise.