Add avatars and thumbnails for Native Chain Tokens

[iamsamgibbs]

Specification

Description

Typically the metadata (including the avatar and thumbnail) for our tokens is stored in the database, which is used when we display them in the app, such as on the balance page, the token select when making payment actions, etc.

The native chain token is different, we don't store it in the database, and as such we don't have any metadata for it. The issue is to add avatar and thumbnail data for each of our supported chains.

The DEFAULT_NETWORK_TOKEN is added to the colony context here: src/apollo/cache/colony/tokens.ts The different tokens can be found TOKEN_DATA here: src/constants/index.ts

Design

Will need to source token logos / ask product to provide.

Implementation

This issue is complete when...

• [ ] The native chain token appears with the avatar in all places it is used (balance page, token select dropdowns, completed actions, etc)

[rdig]

I've assigned myself to this, as my point with this is to put in the bases to for moving all images to S3 storage and away from base64 strings

[jakubcolony]

I got a request from @arrenv to update Ethereum native token name to Ethereum and its avatar to the following image:

At the moment that is blocked by this issue, so leaving a comment for once we are able to do so.