Edx-event-bus-kafka

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Fixed
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* Added ``signal`` back as an argument when creating a consumer for compatibility with the openedx-events API

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Changed
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* Implement openedx-events Event Bus Consumer API.
* **BREAKING CHANGE**: Remove ``consume_events`` management command as this command will be provided by openedx_events. To replay events using the
openedx-events version of the management command, pass ``--extra '{"offset_time": "2023-01-08T06:46:22"}'`` instead of ``-o 2023-01-08T06:46:22``.
* **BREAKING Change**: ``offset_timestamp`` argument has been removed from ``consume_indefinitely`` and ``reset_offsets_and_sleep_indefinitely`` methods.
It is now added as an optional argument named ``offset_time`` to ``KafkaEventConsumer`` constructor.

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Changed
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* Switch from ``edx-sphinx-theme`` to ``sphinx-book-theme`` since the former is
deprecated
* Refactored consumer to manually deserialize messages instead of using DeserializingConsumer
* Make signal argument optional in consumer command (take signal from message headers)

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Added
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* Add function tracing to the event consumption workflow for better monitoring.

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Fixed
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* ``consume_events`` command now loads all public signals so that the consumer can load signals by ``event_type`` even if their modules were not already imported

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Fixed
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* produce_event management command fixed to pass required events_metadata parameter