[Task]: Add notification manager

### Task description

We could improve the way errors are handled in the explorer, if there is an issue fetching data, we could display to the user a small toast message on the right bottom part of the screen showing which error happened

This could be added to all the networks, not just stardust, though we can start with stardust

### Requirements

TBD

### Acceptance criteria

TBD

### Creation checklist

- [ ] I have assigned this task to the correct people
- [ ] I have added the most appropriate labels
- [ ] I have linked the correct milestone and/or project