Part of #646 for messaging spans.

Specify which value of service.target.name we should use or the following span subtypes/instrumentations:

• azurequeue : queue name
• azureservicebus : queue or topic name
• other: use already captured queue name

For AWS, Azure and other cloud-based services, we DO NOT use the region name as a fallback as we do for some services, the general rule is to always use the queue or topic name if available.

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