Adds word cloud xblock extracting from edx-platform repo

[farhan]

Adds word cloud xblock extracting from edx-platform repo

Test PR

Make a test PR on edx-platform like this to run test cases on under development PR.

File references:

• xblocks_contrib/word_cloud/word_cloud.py has been extracted from
• xblocks_contrib/word_cloud/static/html/word_cloud_xblock.html has been extracted from
• xblocks_contrib/word_cloud/static/js/src/word_cloud_xblock.js and other d3-cloud files has been extracted from
• xblocks_contrib/word_cloud/static/css/word_cloud_xblock.css has been extracted from lms/static/css/WordCloudBlockDisplay.css

Acceptance Criteria:

• Extracted XBlock user experience should behave normal if required global css variables donesn't exist
• Extracted XBlock funcationality should work fine after turning its relevant Django Settings Flag
• In existing built in xblock implementation of edx-platform, update the status or data of the XBlocks. Then change the Django Settings flag and verify after shifting to extracted one, XBlocks are maintaining their required states (including XBlock completion status).
• Also test the vice versa of above step, change XBlock from Extracted one to Built in implementation to check fallback case testings.
• i18n is supported in the XBlock
• Create a course, add multiple XBlocks in the course. Keep different XBlocks in diversity of states (done/un-done etc). Export the course then validate the XBlock states after importing it again.
• Make a test PR for the extracted PR like this and fix the test cases if required.
• Write further unit test cases for good code coverage

[kdmccormick]

Just a couple nits so far, but generally this is looking great. I still need to test it myself, but it's exciting to hear that you have this working in edx-platform 🔥

[kdmccormick]

I'm going to hold off on testing this for now. Let's focus on getting all the stub XBlocks into #2, getting that reviewed and merged, and then getting the waffle flags into edx-platform. That way, it will be easy to test this PR in edx-platform.

[kdmccormick]

Could you rebase this Farhan? Then I'll be happy to test this using new flag we've added to edx-platform.

[farhan]

@kdmccormick This PR's branch is already up-to-date with the main branch.

• I think, we can test it on edx-platform by manually install it pip install path-to-xblocks-contrib-proj
• I think, we can run test cases on them, after merging it, releasing a new version and then update on edx-platform`
• I have created this Test PR on edx-platform as well

Please suggest if we have better ways to do
cc: @irtazaakram @ttqureshi

[kdmccormick]

@farhan to test locally with tutor, you can mount the repo and rebuild+reboot:

tutor mounts add path/to/xblocks-contrib
tutor images build openedx-dev
tutor dev reboot

With that setup, you should be able to git switch between xblocks-contrib branches and see that the LMS and CMS containers automatically restart using branch's code.