[FR](Primitives) Notification Component

### On which framework/platform would you like to see this feature implemented?

React

### Which UI component is this feature-request for?

Other

### Please describe your feature-request in detail.

I'd like to show notifications (aka Snackbar) without creating my own.

### Please describe a solution you'd like.

Requested Notification Customizations:
- Title
- Description
- Icon
- Color
- Clearable
- How long it shows on screen
- How many can be shown on screen at one time

Inspiration: https://mantine.dev/core/notification/

### We love contributors! Is this something you'd be interested in working on?

- [ ] 👋 I may be able to implement this feature request.
- [ ] ⚠️ This feature might incur a breaking change.

No files, tests, or entry points are identified in the issue. Start by reviewing the React component patterns in Amplify UI and the linked Mantine notification example; done means a notification component supports the requested title, description, icon, color, clearing, duration, and visible-count customizations.

Written by the indexing model from the issue text.