Token listing ehnancements

[kevinghim]

Background

• We have a growing number of issues related to the application generally assuming "one name, one token".
  • Tokens want longer ticker symbols
    • slack thread
    • Github issue
    • We aren't sure these fit in our UI
    • They seem to get cut off in our UI, providing a risk of not representing different tokens adequately to users.
  • Tokens with duplicate symbols are beginning to pile up in our [[eth-contract-metadata]] registry.
    • We are currently rejecting duplicate symbols, but this is unfair to new tokens.
    • Slack thread with [[Marcin Rabenda]]
    • Github issue example
    • Sample response text
• Those issues are likely to get worse over time
  • With more chains, the number of tokens with similar names will increase.
• Meanwhile, we are also embracing more user-centric naming, like via [[address display fallback logic]].
• We have a need to revisit how we show tokens, and highlight to a user why it is called a given name.
  • From our own list
  • From our [[[[CodeFi]] Improved [[token detection]] v2]]
  • From [[token lists]]
  • From [[EIP-747: wallet_watchAsset]]
  • From user-added via the custom token form

Possible acceptance criteria

- Recognized tokens should show the source of their auto-detection
    - Was this an auto-detected [[proposed name]]?
    - Was this drawn from one or more [[token lists]]?
    - Was this added from a particular domain via [[EIP-747: wallet_watchAsset]]?
    - Was this added manually? When?
- Tokens with names that are similar to other known tokens should be indicated as such.
    - Particularly if the new token name is similar to a token the user already has/trusts.
    - What if the token resembles a token in our auto-detection system that the user has never encountered? Do we need to bother the user about that? Possibly not!
- [[eth-contract-metadata]] should be able to have multiple tokens with the same symbol (but maybe not the same name)
    - Maybe we add fields to distinguish them
        - Official website
        - Support email (as [[MyCrypto]] does)
- When tokens are shown, we should show their `name` field (not just the symbol, which is meant to be shorter).
- Possible: When a token is added/detected, allow the user to either [[pet name]] the token or at least add a personal note to that token, which should then be visible any time that token is interacted with. ("Not the real DAI, just my test token.")
- Anywhere long token names are shown, it should be possible for the user to see the full name (even if cut off in preview).

[kevinghim]

@alfeng6