Upgrade core-backend to ES2022

[pmconne]

Don't merge - for demonstration purposes only.

This produces a slew of test failures, occurring when inserting a model, because modeledElement is undefined.

Model constructor calls Entity constructor. When Entity constructor exits, this.modeledElement is valid. When execution returns to Model constructor, this.modeledElement is undefined.

The property gets assigned via black magic in Entity.forEachProperty. Something in ES2022 changes the behavior there.

I had upgraded core-backend to target ES2022 in #6572 because TypeScript doesn't provide type declarations for Intl.Segmenter for older targets.

[kabentley]

maybe the constructor for Entity should be:

  protected constructor(props: EntityProps, iModel: IModelDb) {
    this.iModel = iModel;
    this.id = Id64.fromJSON(props.id);
    // copy all auto-handled properties from input to the object being constructed
    iModel.forEachMetaData(props.classFullName, true, (propName: string, meta: PropertyMetaData) => (this as any)[propName] = meta.createProperty((props as any)[propName]), false);
  }

I don't know if that will help but we won't be permuting this while we're calling a method on it.