Update components: Avatar, Token, Network

[brianacnguyen]

Description

Update Mobile Avatars to align with Figma

References

https://www.figma.com/file/HKpPKij9V3TpsyMV1TpV7C/DS-Components?node-id=1614%3A12084

Acceptance Criteria

• [ ] Snapshot and unit tests pass
• [ ] Storybook shows interactive version of component. Include screenshot or video in pull request for visual reference.
• [ ] Component structure should resemble the structure listed in the Technical Details section above.

Related

https://github.com/metamask/metamask-mobile/issues/5338