feat: expose create_by field in PublishableEntityMixin [FC-0062]

[rpenido]

Description

This PR exposes the create_by field in PublishableEntityMixin to facilitate it's use.

More Information

• feat: return publishing information on get component endpoint [FC-0062] openedx-platform#35476 (comment)

Part of:

• Component Sidebar: Manage tab frontend-app-authoring#1190

Testing Instructions

Check openedx/frontend-app-authoring#1275

---

Private ref: FAL-3802

[openedx-webhooks]

Thanks for the pull request, @rpenido!

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[pomegranited]

👍 Thanks for adding this missing property :)

• I tested this while testing openedx/openedx-platform#35476
• I read through the code
• I checked for accessibility issues N/A
• Includes documentation N/A
• User-facing strings are extracted for translation N/A