Use tokens.json for detecting tokens as Spam

[hboon]

• [ ] #3114
• [x] #3127
• [x] #3128
• [x] #3129
• [x] #3130

[JamesSmartCell]

@justindg can you update to include and handle the new 'spam' mapping? We already have a spam icon which is common in the iconassets repo, you'll probably need to pull this out and add as Android asset to use directly as the token icon when it's a spam.

Also, if any Spam token has a value picked up, it's safe to ignore that. You can show it but maybe grey it out and don't add to the summary.

[hboon]

We already have a spam icon which is common in the iconassets repo, you'll probably need to pull this out and add as

That's one in #3130