Use Ankr to generate token lists #86
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Resolves #82
Resolves #84
Remaining work and other issues
I was going to cache is_erc20 values similar to how we are caching coingecko IDs (since Ankr does not include this information), but I couldn't find a way to look up whether a given token is an ERC20 (previously thought this would be possible via an on-chain supportsInterface contract call, but ERC20s don't seem to support ERC165...). So that's still TBD.
We need to add native tokens which are not included in the Ankr response.
We need to download and compress images in for the tokens similar to how we are doing already.