fix: improve customization fab

[AlexVarchuk]

What/Why/How?

fixes #1850
added availability to customize FAB:

• theme property for changing background color and icon color for the FAB

fab: {
 backgroundColor: 'red',
 color: 'white',
}

• property hideFab for non-display floating action button.

Reference

Testing

Screenshots (optional)

Check yourself

• Code is linted
• Tested
• All new/updated code is covered with tests

[adamaltman]

I learned something new today:

Fab icons
A floating action button (FAB) performs the primary, or most common, action on a screen. It appears in front of all screen content, typically as a circular shape with an icon in its center. FABs come in three types: regular, mini, and extended.

😆 🚀