Add a Loading button with animated spinner

[Steve-Mcl]

Description

When operating async tasks (like the new "Enable Device Editor" button) it would simplify the frontend code and and beautify our UI to have a "Loading Spinner" button like https://tailwindcomponents.com/component/button-with-loader

@joepavitt assigned as requested.

Thanks.

[joepavitt]

Can utilise tailwind's animation classes for this: https://tailwindcss.com/docs/animation#spin

[joepavitt]

Will do in 1.8

[joepavitt]

Can utilise same mechanism added in #151