Refactor fetching token information: symbol, decimals, etc

Current logic for fetching token information is overcomplicated and not working properly (https://github.com/gnosis/safe-react/issues/1068).

So, the problem: Currently token information is fetched for a transaction inside fetchTransactions (https://github.com/gnosis/safe-react/issues/1070). This shouldn’t be a thing, imagine the following example:

• we get a transaction with an unknown token, we fail to fetch info and now showing UNKNOWN
• later we get this token info from the backend
• UNKNOWN will still be shown because the token info is tied to the transaction

Possible solution: Implement a react component for displaying token symbols with a usage like this: <TokenSymbol address={} It should get the symbol from state, if there’s no info in state, fetch it This function should work as a good base: https://github.com/gnosis/safe-react/blob/a5b45850494097e7b288e84dc25e0b8a8a017564/src/logic/tokens/store/actions/fetchTokens.ts#L60

[Agupane]

Ahhh got it, now it makes sense, thanks for the clarification! @Uxio0

[katspaugh]

This has been refactored since, so I think we can close it.