refactor: use Slot component instead of getButtonCn 🔄

[ramiAbdou]

Description ✏️

This PR creates a Button.Slot component which uses Radix's utility Slot component to merge props onto the child. This means that we can be more declarative when trying to apply button styling to an anchor element.

Type of Change 🐞

• Feature - A non-breaking change which adds functionality.
• Fix - A non-breaking change which fixes an issue.
• Refactor - A change that neither fixes a bug nor adds a feature.
• Documentation - A change only to in-code or markdown documentation.
• Tests - A change that adds missing unit/integration tests.
• Chore - A change that is likely none of the above.

Checklist ✅

• I have done a self-review of my code.
• I have manually tested my code (if applicable).
• I have added/updated any relevant documentation (if applicable).