Openedx-events

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Changed
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* **Breaking change**: ``send_event_with_custom_metadata`` changes to accept a single EventsMetadata object rather than all of the fields that go into one. This only directly affects event bus consumer libraries.

Added
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* Added ``COURSE_CERTIFICATE_CONFIG_CHANGED`` and ``COURSE_CERTIFICATE_CONFIG_DELETED`` signals for when a course's certificate configuration is updated or deleted

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Added
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* Added ``send_event_with_custom_metadata``. This will enable event bus consumers to send the event signal with the same metadata fields that were used when the event was produced.

Fixed
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* Updated time metadata to include UTC timezone. The original implementation used utcnow(), which could give different results if the time were ever interpreted to be local time. See https://docs.python.org/3/library/datetime.html#datetime.datetime.utcnow
* EventsMetadata minorversion is now fully optional, and doesn't need to be supplied when initializing to get the default of 0.

Changed
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* Updated send_event with an optional time argument to be used as metadata.

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Changed
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* Use collections.abc import to use with python 3.8 and 3.10.

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Added
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* Added new XBLOCK_PUBLISHED, XBLOCK_DUPLICATED and XBLOCK_DELETED signals in content_authoring.
* Added XBlockData and DuplicatedXBlockData classes
* Added custom UsageKeyAvroSerializer for opaque_keys UsageKey.

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Changed
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* **Breaking change** Make event_metadata parameter in EventBusProducer send API required

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Changed
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* Add event_metadata parameter to EventBusProducer send API. **Note:** Calling this method with the new argument will throw an exception with older versions of this library that don't yet support the parameter.