[BD-13][BB-6735] refactor: Unify XBlock naming

[0x29a]

Description

Since the XModules framework legacy code is being removed, it's time to unify the terms used to refer to XBlocks.

As there are tens of thousands occurrences of module, descriptor and item across the platform code, this PR covers getting rid of the module term in the context of renaming XBlocks files in the xmodule/ directory.

Specifically, this PR:

• Renames the following files / directories and updates corresponding imports:
  • xmodule/annotatable_module.py -> xmodule/annotatable_block.py
  • xmodule/capa_module.py -> xmodule/capa_block.py
  • xmodule/conditional_module.py -> xmodule/conditional_block.py
  • xmodule/course_module.py -> xmodule/course_block.py
  • xmodule/editing_module.py -> xmodule/editing_block.py
  • xmodule/error_module.py -> xmodule/error_block.py
  • xmodule/hidden_module.py -> xmodule/hidden_block.py
  • xmodule/html_module.py -> xmodule/html_block.py
  • xmodule/library_content_module.py -> xmodule/library_content_block.py
  • xmodule/lti_module.py -> xmodule/lti_block.py
  • xmodule/mako_module.py -> xmodule/mako_block.py
  • xmodule/poll_module.py -> xmodule/poll_block.py
  • xmodule/randomize_module.py -> xmodule/randomize_block.py
  • xmodule/raw_module.py -> xmodule/raw_block.py
  • xmodule/seq_module.py -> xmodule/seq_block.py
  • xmodule/template_module.py -> xmodule/template_block.py
  • xmodule/word_cloud_module.py -> xmodule/word_cloud_block.py
  • xmodule/wrapper_module.py -> xmodule/wrapper_block.py
  • xmodule/xml_module.py -> xmodule/xml_block.py
  • xmodule/video_module -> xmodule/video_block and xmodule/video_module/video_module.py -> xmodule/video_block/video_block.py
  • xmodule/split_test_module.py -> xmodule/split_test_block.py
• For each file, it also renames strings like course module / course_module / coursemodule in comments, string constants and function names (where it's safe).
• Updates path to these files in *.po files.

Supporting information

• Blocks: [BD-13][BB-6735] refactor: rename hidden_module.HiddenDescriptor -> hidden_block.HiddenBlock openedx-unsupported/configuration#6833.
  - ❗ Can be breaking, as MODULESTORE Django setting has to be updated to reflect the changed HiddenBlock path. We have introduced a fallback mechanism when the default_class cannot be imported.

Testing instructions

Use https://extpr31113.sandbox.opencraft.hosting (email: staff@example.com, password: edx) to perform general testing.

[openedx-webhooks]

Thanks for the pull request, @0x29a!

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

[Agrendalath]

@0x29a, the code looks good to me, but how can I test it locally? I followed the steps defined here, purged all caches, and recreated my devstack, but I keep getting the following exception:

Traceback (most recent call last):
  File "/edx/app/edxapp/venvs/edxapp/lib/python3.8/site-packages/django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "/edx/app/edxapp/venvs/edxapp/lib/python3.8/site-packages/django/core/handlers/base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/usr/lib/python3.8/contextlib.py", line 75, in inner
    return func(*args, **kwds)
  File "/edx/app/edxapp/venvs/edxapp/lib/python3.8/site-packages/django/contrib/auth/decorators.py", line 21, in _wrapped_view
    return view_func(request, *args, **kwargs)
  File "/edx/app/edxapp/venvs/edxapp/lib/python3.8/site-packages/django/utils/decorators.py", line 130, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "/edx/app/edxapp/edx-platform/openedx/core/djangoapps/util/maintenance_banner.py", line 42, in _decorated
    return func(request, *args, **kwargs)
  File "/edx/app/edxapp/edx-platform/common/djangoapps/student/views/dashboard.py", line 652, in student_dashboard
    errored_courses = modulestore().get_errored_courses()
  File "/edx/app/edxapp/edx-platform/xmodule/modulestore/django.py", line 330, in modulestore
    _MIXED_MODULESTORE = create_modulestore_instance(
  File "/edx/app/edxapp/edx-platform/xmodule/modulestore/django.py", line 303, in create_modulestore_instance
    return class_(
  File "/edx/app/edxapp/edx-platform/xmodule/modulestore/mixed.py", line 160, in __init__
    store = create_modulestore_instance(
  File "/edx/app/edxapp/edx-platform/xmodule/modulestore/django.py", line 303, in create_modulestore_instance
    return class_(
  File "/edx/app/edxapp/edx-platform/xmodule/modulestore/split_mongo/split.py", line 659, in __init__
    class_ = getattr(import_module(module_path), class_name)
  File "/edx/app/edxapp/venvs/edxapp/lib/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 973, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'xmodule.hidden_module'

[0x29a]

@Agrendalath, ah, I forgot to mention this in the PR description. You have to run pip install -e . in the root of your container, so the openedx package is reinstalled. If that's not the case, please consider the related configuration PR. You might need to update MODULESTORE value in the lms.yml and studio.yml.

[Agrendalath]

You might need to update MODULESTORE value in the lms.yml and studio.yml.

@0x29a, this one did the trick. Thanks!

[Agrendalath]

@0x29a, could you please rebase the PR?

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[edx-pipeline-bot]

EdX Release Notice: This PR has been deployed to the staging environment in preparation for a release to production.

[edx-pipeline-bot]

EdX Release Notice: This PR has been deployed to the production environment.

[kdmccormick]

This is awesome. Great work to everyone involved in getting this point 🎸⚡