fix: wait for dynamic editor libs to load in editor mode

[CezCz]

Description

In case editor libs (page.js and so on) are loaded dynamically. The execution must wait untill the scripts trigger load event.

Motivation and Context

The problem was when pagemodel was loaded, an event triggered and there was nobody yet (i.e message.js from editor's package) to listen to this event.

How Has This Been Tested?

Manual + automated tests More tests to come

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ ] I have signed the Adobe Open Source CLA.
• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[github-actions[bot]]

:tada: This PR is included in version 1.3.7 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: