feat: Changes in xblock_v2 to support studio_view [FC-0076]

[ChrisChV]

Description

Updates to support studio_view (editors) in xblock_v2 iframe.

• Send a message when cancel button is clicked on xblock_v2 iframe
• Send a message when save button is clicked on xblock_v2 iframe
• Send notify function in runtime. This is to avoid errors when saving the Xblock
• Which edX user roles will this change impact? "Course Author", "Developer"

Supporting information

• Github issue: Discovery: Editing other types of XBlocks frontend-app-authoring#1201
• Used in: feat: Add AdvancedEditors with an iframe [FC-0076] frontend-app-authoring#1568

Testing instructions

Follow the testing instructions at openedx/frontend-app-authoring#1568

Deadline

"None" if there's no rush, or provide a specific date or event (and reason) if there is one.

Other information

N/A

[openedx-webhooks]

Thanks for the pull request, @ChrisChV!

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[ChrisChV]

I'm not sure what to put here yet, but it could be implemented in a separate task after the prototype is approved. I have left it empty for now, since it was not previously created for anything.