feat: enable producing to event bus via settings

[navinkarkera]

Description: Implements ADR merged in #224 .

ISSUE: #210

Testing instructions:

• Clone this repository and checkout this PR.
• Update stub implementation of producer based on below patch

diff --git a/openedx_events/event_bus/__init__.py b/openedx_events/event_bus/__init__.py
index 582effe..a4bf597 100644
--- a/openedx_events/event_bus/__init__.py
+++ b/openedx_events/event_bus/__init__.py
@@ -100,6 +100,11 @@ class NoEventBusProducer(EventBusProducer):
             event_metadata: EventsMetadata,
     ) -> None:
         """Do nothing."""
+        print("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++")
+        print(f"""NoEventBusProducer#send signal: {signal}""")
+        print(f"""NoEventBusProducer#send topic: {topic}""")
+        print(f"""NoEventBusProducer#send event_key_field: {event_key_field}""")
+        print(f"""NoEventBusProducer#send event_data: {event_data}""")
+        print(f"""NoEventBusProducer#send event_metadata: {event_metadata}""")
+        print("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++")

• Install requirements locally using make requirements.
• Open a django shell using python manage.py shell.
• Run below snippet and verify that handlers print correct data.

from openedx_events.content_authoring.signals import XBLOCK_DELETED, XBLOCK_PUBLISHED, XBLOCK_DUPLICATED
from openedx_events.content_authoring.data import XBlockData, DuplicatedXBlockData
data = XBlockData(usage_key="block-v1:edx+DemoX+Demo_course+type@video+block@UaEBjyMjcLW65gaTXggB93WmvoxGAJa0JeHRrDThk", block_type="video")
dup = DuplicatedXBlockData(usage_key="block-v1:edx+DemoX+Demo_course+type@video+block@UaEBjyMjcLW65gaTXggB93WmvoxGAJa0JeHRrDThk", source_usage_key="block-v1:edx+DemoX+Demo_course+type@video+block@UaEBjyMjcLW65gaTXggB93WmvoxGAJa0JeHRrDThk", block_type="video")
XBLOCK_DELETED.send_event(xblock_info=data)
XBLOCK_PUBLISHED.send_event(xblock_info=data)
XBLOCK_DUPLICATED.send_event(xblock_info=dup)

• Make sure that only the events configured in EVENT_BUS_PRODUCER_CONFIG are printed by the stub implementation of event bus producer.

Reviewers:

• @tecoholic

Merge checklist:

• All reviewers approved
• CI build is green
• Version bumped
• Changelog record added
• Documentation updated (not only docstrings)
• Commits are squashed

Post merge:

• Create a tag
• Check new version is pushed to PyPI after tag-triggered build is
  finished.
• Delete working branch (if not needed anymore)

Author concerns: List any concerns about this PR - inelegant
solutions, hacks, quick-and-dirty implementations, concerns about
migrations, etc.

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[tecoholic]

@navinkarkera 👍 LGTM

• I tested this: Followed the testing instructions and verified that signals are being sent as per the configuration.
• I read through the code
• I checked for accessibility issues - NA
• Includes documentation

A couple of points I noticed:

• fastavro 1.8.0 seems to have some build issues (it failed to build for me on Apple ARM64) and they seems to have fixed it in version 1.8.1. I was able to test it after changing requirements/dev.txt to use fastavro==1.8.1. Maybe it's worth updating it.
• I added a suggestion about using Pydantic for config validation. I haven't considered the cost of adding an additional dependency, but, it might be worth considering and it definitely not a blocker here.

[robrap]

@navinkarkera: I added waiting for eng review for my team (arch-bom). I'm trying this process out. Let me know if this ends up being a process problem. Thanks.

[rgraber]

Some nits, but nothing blocking.

[rgraber]

@navinkarkera I think this is ready to merge. I had nits but you can choose to address them or not, they're not blocking.

[mphilbrick211]

Hi @navinkarkera! Just flagging that some branch conflicts have popped up.

[robrap]

@mphilbrick211: We heard Navin may be on vacation, so we'll hear back when we hear back.

[mphilbrick211]

@mphilbrick211: We heard Navin may be on vacation, so we'll hear back when we hear back.

Yes, thank you, @robrap! I forgot he was away.

[openedx-webhooks]

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