Parse ESM Scripts in Editor

[marklundin]

Ability to parse ESM Script in the editor

Currently Scripts are evaluated in the editor which checks for errors and validates the scripts attributes. This should also work for ESM Scripts, however as they're modules, the have sub dependancies which also need to be evaluated. This presents a number of additional tasks

• Parse ESM ScriptType attributesDefinition https://github.com/playcanvas/editor-ui/pull/209
• Allow script inheritance Editor is unable to parse extended scripts #188