Edx-event-bus-kafka

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Changed
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* Added/removed some custom attributes used for monitoring. Search for custom_attribute_name annotations for details.

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Changed
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* Add timestamp parameter for consumer, allowing the starting offset for consuming to be overridden from the default.

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Added
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* A variety of custom attributes are now set for monitoring purposes. Search for custom_attribute_name annotations for details.

Changed
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* Error recording to the log will now include message details when the message is available on the error.

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Changed
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* **BREAKING CHANGE**: Make event_metadata parameter required

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Changed
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* Set CloudEvent headers on events using an optional event_metadata parameter

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Changed
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* Implement openedx-events Event Bus Producer API
* **BREAKING CHANGE**: Remove caching from ``get_producer`` and rename to ``create_producer``, as we now rely on the wrapper in openedx-events to cache that call

Upgrading library from 1.x:

- Replace calls to ``edx_event_bus_kafka.get_producer`` with ``openedx_events.event_bus.get_producer``
- Add Django setting ``EVENT_BUS_PRODUCER = "edx_event_bus_kafka.create_producer"``

These breaking changes are only relevant for the producing side. (This should only include the CMS at the moment.)