[BD-03] [TNL-2624] [BB-3168] Piazza Plugin for discussions

[xitij2000]

Adds a plugin to enable Piazza discussions in the discussions tab.
Build on https://github.com/edx/edx-platform/pull/24584

Dependencies: https://github.com/edx/edx-platform/pull/24584

Screenshots: Always include screenshots if there is any change to the UI.

Sandbox URL: sandbox is being provisioned.

• LMS: https://pr25552.sandbox.opencraft.hosting/
• Studio: https://studio.pr25552.sandbox.opencraft.hosting/

Test Instructions:

• After checking out this branch run pip install -e . in the edx-platform directory in the lms and studio containers so that changes to setup.py are picked up.
• Visit http://localhost:18000/admin/discussions/discussionproviderconfig/ and add a new provider config for Piazza.
  • Give it any name
  • Select "Piazza" as the discussion provider
  • Set the config to {"consumer_key":"piazza.sandbox","consumer_secret":"test_only_secret"}
  • Leave the rest empty and save.
• Visit http://localhost:18000/admin/discussions/learningcontextdiscussionconfig/ and add a new object
  • Enter a valid course id in the Learning Context field
  • Enabled should be checked
  • Select the new provider.
  • Leave the overrides blank.
• Visit the course page on the LMS
• Make sure the Discussion tab is visible
• Clicking on the tab should load up an Piazza in an iframe.

Reviewers

• (OpenCraft internal reviewer's GitHub username goes here)
• edX reviewer[s] TBD

Settings

EDXAPP_FEATURES:
  ENABLE_COMBINED_LOGIN_REGISTRATION: true

FORUM_VERSION: open-release/juniper.master
forum_version: open-release/juniper.master

[openedx-webhooks]

Thanks for the pull request, @xitij2000! I've created BLENDED-665 to keep track of it in Jira.

When this pull request is ready, tag your edX technical lead.

[xitij2000]

@davidjoy This is the Piazza plugin pr. I've added testing instructions here.
This is still WIP, but it works, and the overall approach is final. I'm working on what needs to be tested and where/how to split the responsibility of the LTI launch.
I've also made an internal PR from the same branch; open-craft#291
That PR targets the branch this is based on, so only has the relevant changes.

[edx-status-bot]

Your PR has finished running tests. There were no failures.