Add support for kombu

[hmstepanek]

Overview

Add message broker support for Kombu.

This includes the addition of two settings:

• kombu.consumer.enabled - this enables instrumentation specifically for the Kombu consumer. Existing customers that use Celery may otherwise see duplicated transactions when consuming messages-one from Kombu and one from Celery.
• kombu.ignored_exchanges - this contains a default to ignore the celeryev queue which is a monitoring queue for rabbitmq. Monitoring this queue by default just creates a lot of noise.

[github-actions]

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