add transition callbacks to Toast

[ysshir]

Add animation callbacks to Toast.

Fixes #6152
The previous commit #6261 has not been merged.

[kyletsang]

Could you please add tests? Thanks

[ysshir]

@kyletsang

Thank you for the review.

I've corrected the typo and written a test and an example. It works fine in the example, but the test failed. I noticed that the "onEntered" is not being called, but I couldn't figure out why.

Any ideas? Thanks.

[kyletsang]

The toast tests uses fake timers so you need to manually advance the clock so code within functions like setTimeout will trigger. If you check the other tests, they call the tick function like clock.tick(250);. You'll need to do this within your test.

[ysshir]

@kyletsang

Thank you for the advice!!
I believe the test is okay for now.

[kyletsang]

Code and tests look good. The example currently isn't mobile friendly though. I'm thinking we probably don't need the example at all actually, since the props are pretty straight forward. Could you remove the example from this PR?

[kyletsang]

Thanks!