Add `:to` prop to button component

[MahmoudGhalayini]

Description:

I'd like to propose adding a :to prop to the button component to enable Vue Router navigation functionality. This would allow buttons to act as navigation links while maintaining their visual styling and behavior.

Usage:

<fwb-button :to="/dashboard">Go to Dashboard</fwb-button>
<fwb-button :to="{ name: 'user-profile', params: { id: 123 } }">View Profile</fwb-button>

Benefits:

• Seamless integration with Vue Router
• Maintains button styling while providing navigation
• Consistent API with router-link functionality

I'm happy to implement this feature if there's interest. The implementation would render a router-link internally when the :to prop is provided, while falling back to a regular tag element otherwise.