Feature requests for angular v20 and zoneless support

[alanpurple]

Feature Requests

• Support Angular version 20
• Remove zone.js dependency
• migrate to zoneless

[WalterNorthwoods]

Note how the gojs-angular component has mouse-move events run outside of the Angular zone for performance/efficiency reasons. If we can easily implement that optimization in Angular 20, and there aren't any other problems, then I hope we can go zoneless.

[alanpurple]

@WalterNorthwoods

Thank you always