[6.x] Add a Text component

[jaygeorge]

Description of the Problem

Sometimes it would be handy for users to have a <Text> component that lets you specify options like strong, subtle etc etc, for when you want to style text inside a table, or inside a widget.

For example, here you might want to make the callback url and last received to be a "subtle" text variation

What this PR Does

• Adds a text UI component for rendering styled text with consistent variants and sizes
• Renders as a by default, but configurable via the as prop (span, p, div)

[ryanmitchell]

thank you for this ❤️