8767 - Add a callback function setting in notification

[ericangeles]

Explain the details for making this change. What existing problem does the pull request solve?

This PR adds a callback function setting that executes an action before the notification is closed.

In the example, a toast message is shown when the notification is closed.

Related github/jira issue (required):

Closes #8767

Steps necessary to review your pull request (required):

• Pull this branch, build, and run the app
• Go to http://localhost:4000/components/notification/example-widget.html
• Close any notification
• It should show a toast message (this is due to a callback function as a setting)

Included in this Pull Request:

• A test for the bug or feature.
• A note to the change log.

[ericangeles]

Tagging WIP, as I will add a test for this feature.

[tmcconechy]

@ericangeles looks good. maybe we can name the callback in case there is in the future other ones such as closeCallback or clickCallback?

[glenlieorillo]

before fix:

Screen.Recording.2024-08-05.at.1.02.46.PM.mov

after fix:

Screen.Recording.2024-08-05.at.1.02.26.PM.mov

[jbrcna]