Create skeleton page for question selection shopping cart workflow

[ozer550]

Summary

• Creates the skeleton page that could be further used in quizzes for question shopping cart workflow.
• Integrates the page with the currently existing lessons workflow. (It will be later migrated to quizzes once refactoring has been done for it.)
• Adds appropriate routes in the lessons page to navigate to the questions shopping cart.
• Mocks and implements basic data and functionality for the shopping cart.

References

Implements basic functionality of #12789 in lessons sidePanel subpage. We need to migrate this later to quizzes.

Reviewer guidance

• Navigate to the following route /en/coach/#/:classId/lessonstemp/:lessonId/select-resources/preview-questions
• Check if the QuestionsAccordion matches the figma, see question selection "manual" titled workflow.

[AlexVelezLl]

lgtm! After rebasing and solving the conflicts, we can merge and once #13034 is solved, we can conect the dots. Thanks @ozer550!

[github-actions]

Build Artifacts

Asset type	Download link
PEX file	kolibri-0.18.0a0.dev0_git.510.g0797f5a9.pex
Windows Installer (EXE)	kolibri-0.18.0a0.dev0+git.510.g0797f5a9-windows-setup-unsigned.exe
Debian Package	kolibri_0.18.0a0.dev0+git.510.g0797f5a9-0ubuntu1_all.deb
Mac Installer (DMG)	kolibri-0.18.0a0.dev0+git.510.g0797f5a9.dmg
Android Package (APK)	kolibri-0.18.0a0.dev0+git.510.g0797f5a9-0.1.4-debug.apk
Raspberry Pi Image	kolibri-pi-image-0.18.0a0.dev0+git.510.g0797f5a9.zip
TAR file	kolibri-0.18.0a0.dev0+git.510.g0797f5a9.tar.gz
WHL file	kolibri-0.18.0a0.dev0+git.510.g0797f5a9-py2.py3-none-any.whl

[AlexVelezLl]

Thanks @ozer550!