Extends Editor Lite to support extensions and custom options to be passed directly to createInstance

What does this MR do?

This is Part 1 of the steps for #232503 (closed)

As the title suggests: it extends Editor Lite to support extensions and custom options to be passed directly to createInstance. Previously we would need a separate step to apply extensions for the editor's instance. Now we can two things right when the instance gets initialized:

• specify extensions to apply by thier paths
• specify additional editor options on a per-instance basis

Screenshots

No visual changes

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Related to #232503 (closed)