fix: Add title property in web-components/fast-foundation/src/button

[marcoseiza]

🐛 Bug Report

The web component button implementation doesn't have a title attribute. (https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/title)

This means that the button doesn't show a tooltip when keyboard focused.

💻 Repro or Code Sample

<fast-button title="test"></fast-button>

• Hover over the element, observe tooltip
• Keyboard focus the element, observe no tooltip

🤔 Expected Behavior

Both hover and keyboard focus should show a tooltip.

💁 Possible Solution

Add a title attribute to web-components/fast-foundation/src/button

🔦 Context

This is an accessibility concern with the button implementation.