Token refactor follow-up: config updates

[artursapek]

This makes some breaking changes to the config, so that it works with the new arbitrary tokens system.

Breaking changes

Token whitelist

The token whitelist used to reference tokens by their "keys" like this:

{
  tokens: ["USDCeth", "USDCsol"]
}

Since tokens no longer have these custom keys, we now support two other means of whitelisting tokens:

1. Integrators can easily whitelist a single token across all chains by providing its symbol
2. Integrators can also be more granular by providing token tuples ([chain, address]).

{
  tokens: ["USDC", ["Solana", "2qEHjDLDLbuBgRYvsxhc5D6uDWAivNFZGan56P1tpump"]]
}

This config whitelists USDC coin on all chains, and Pnut the Squirrel on Solana. There is some nuance to how this works because of wrapped tokens, which is explained here.

Default tokens

The DefaultInputs config now has to be either the symbol or the address for the token.

{
  ui: {
    defaultInputs: {
      fromChain: 'Solana',
      fromToken: '2qEHjDLDLbuBgRYvsxhc5D6uDWAivNFZGan56P1tpump',
      toChain: 'Ethereum',
      toToken: 'USDC',
    }
  }
}

New properties

This also adds a new config option which disables the ability to paste in token addresses:

{
  ui: {
    disableArbitraryTokens: true
  }
}

This is set to true by default if an integrator provides the tokens whitelist.

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[emreboga]

If the integrator explicitly specifies disableArbitraryTokens = false while having whitelist tokens in the config, should that still enable arbitrary tokens?

[artursapek]

good question... I can add support for that

[artursapek]

62b973c

[emreboga]

Above it says "If there is a single native token with that symbol, we simply use that", bu I can't find where that's implemented in this loop.

[artursapek]

the foundNative flag is how that's implemented. although you're right the comment is slightly inaccurate: we don't check that there's only one native (not wrapped) token with the symbol; we simply take the first one we find. if there were two native tokens with the same symbol, it would choose one of them arbitrarily. this isn't likely to happen, but it's possible.

I suppose I could remove the break on line 223 to include all native tokens with a matching symbol?

[emreboga]

Yes, I think that'll work.