Implement an Aria-Live Alert Sub-System

[myvuuu]

🚀 Feature Proposal

Create an aria-live alert sub-system for Canvas components to pass messages and alerts to that will be announced by a screen reader. This aria-live sub-system should be implemented in:

• [ ] Toast
• [ ] Breadcrumbs
• [ ] Pagination

Success Criteria:

• [ ] Aria-live alert sub-system is built
• [ ] Aria-live alert system is implemented in Toast, Breadcrumbs, and Pagination
• [ ] Toast, Breadcrumbs, and Pagination docs are updated to help users use the new aria-live alert system

Motivation

This will help us enhance the accessibility features for Canvas Toast, which currently does not announce alerts to screen readers.

[jaclynjessup]

These components: Toast, Breadcrumbs, and Pagination - should be able to work with an aria-live sub-system even if built by another team.

Based on the closed Spike #1630 it was deemed we would not build this but now we are. This will be put on hold till @NicholasBoll is back & further discussion will be held.