Add token Icons (spike)

We've been asked to add icons for tokens. There are a few different approaches to adding icons.

What are the options?

- include them in library
- does that negatively impact bundle size?
- separate rimble package of only crypto icons
- determine an approach for how to integrate with current Icon component
- does this break or extend nicely?

- rmdi package that scrapes the icons and wraps them in react components that play nice with styled-components (npm dependency)
- can we extend this process to new, custom icons?

Requirements:
- svg only (where do we find these)
- source from other open source projects
- which tokens?
- whatever decision increases the utility and use of rimble-ui
- How can we expand this to include other tokens/brands

Acceptance criteria:
- Figure out tree-shake icons
- Include RMDI + crypto icons
- try on existing `rimble-ui` library

e: 2d