feature/fix: add support onBlur and onFocus

[georg-pandekhfumani-redshelf]

issue: #490
Problem: So, basically if we talking about accessibility - when user have focus on the snackbar we shouldn't hide snackbar after some autoHideDuration time. Notistack doesn't supports onFocus and onBlur events.

Steps to reproduce problem:

1. use 'Tab' key or screen reader to focus on snackbar (close icon, actions buttons, whole snackbar);
2. see that snackbar hides after autoHideDuration time passes.

How to test:

1. use 'Tab' key to focus on snackbar and be sure that snackbar doesn't close,
2. use 'Tab' key or mouse click on other space to blur and be sure that snackbar hide after autoHideDuration provided time.
3. use 'Tab' key to focus on snackbar and make onMouseLeave event and be sure that timer didn't resumed and snackbar didn't hide.

[ghost]

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[georg-pandekhfumani-redshelf]

Hey @iamhosseindhv, did you get an ability to look at this PR? If you need from me to clarify something feel free to ask.

[slayybelle]

Hey, thanks for doing this! Hopefully someone will review it soon?

[puranjayjain]

With a forwarded ref's help someone can do this in a custom notification component without the need for adding the handlers as you did.