Toolbar: Add new prop with correct spelling "Visibility" to Toolbar Components

[tlabaj]

Describe the issue. What is the expected and unexpected behavior?
See issue #4499. The prop visiblity is misspelled. Since changing it would be a breaking change, let's add a new prop with the correct spelling and deprecate the misspelled prop. All examples should be updated to use the correctly spelt prop

The following components all need to

• ToolbarItem
• ToolbarContent
• ToolbarGroup
• ToolbarToggleGroup

[cdcabrera]

Much appreciated @jenny-s51 ! @zanewoodfin all yours. Self assigning in the meantime