feat: use cache for token details and improve architecture

[anxolin]

This PR addresses some leftovers from the hackathon.

Cache improvements

We remove a lot of RPC calls for getting over and over the: symbol, decimals, name

This info is highly cacheable and already part of a repository.

Architeture improvements

The API was depending directly from the repository layer, which should not be the case (should use the services).

Also, we have a more clear separation of reponsabilities between the ERC20 repo and the balances one.
The later is not loading token info anymore.

Test

1. yarn start
2. Input your wallet for gnosis chain and 2 tokens you like. On of them, you should have balance
3. Press connect, make sure balances load
4. Do a trade in CoW Swap selling 1 of the tokens and buying the other token
5. Make sure the balances update

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​types/​uuid@​10.0.0

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