gnosis / dex-services / 4695

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travis-pro

Token by symbol or address (#1294)

One step towards #1275 

This PR implements handling of token symbols and addresses for incoming requests. Note that there is still no implementation for mapping token symbols and addresses to token IDs, that will come in a follow up PR.

### Test Plan

```
$ cargo run -p price-estimator -- --orderbook-file target/orderbook.mainnet.bin
...
$ curl -s 'http://localhost:8080/api/v1/markets/WETH-OWL/estimated-buy-amount/1?atoms=true' | jq 
{
  "message": "token symbol or address not found"
}
```

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