feat(button): add variables for customizing hover

[brandyscarney]

Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
• Build (npm run build) was run locally and any changes were pushed
• Lint (npm run lint) has passed locally and any fixes were made for failures

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Issue Number: fixes #17974

What is the new behavior?

• Adds --background-hover and --color-hover variables to button
• Styles them to have hover states

Does this introduce a breaking change?

• Yes
• No

Other information

[liamdebeasi]

🎉 Nice job!