Create, Build, and Style > Spinner

This issue is to complete the ~"pajamas::create", pajamasbuild, ~"pajamas::style" portion of ~"component::spinner" as part of FY20-Q2 OKR to Improve the quality and consistency of our UI.

This includes a single-source-of-truth component that is implemented in Vue and thoroughly documented on design.gitlab.com. This does not include implementing the component throughout the product.

Related epics:

• Components of Pajamas Design System
• Pajamas component: Spinner

Related issues:

• FY20-Q2 UX OKR: Improve the quality and consistency of our UI