Replaces CodeMirror with Monaco for scripting editors under the experimental scripting sandbox.
The legacy CodeMirror-based editors are preserved for backwards compatibility and will
continue to power the legacy scripting sandbox.
This introduces improved type support, IntelliSense, and JSDoc hinting via Monaco, with
the backing for pre-request and post-request scripts in tabbed views. Type definitions are
isolated per editor to avoid variable leakage.