gnosis / dex-services / 4823 / 3

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Search by symbol (#1323)

This PR adds the ability of to use symbols for currency pairs. Note that the symbols are retrieved from the EVM, so it is possible that names with duplicates (such as `DAI`) run into collisions and require updating our deployment.

### Test Plan

```
$ cargo run -p price-estimator -- --token-data '{"T0009":{"alias":"sUSD depr","decimals":18},"T0012":{"alias":"SAI","decimals":18},"T0015":{"alias":"SNX depr","decimals":18}}'
...
$ curl -s 'http://localhost:8080/api/v1/markets/WETH-DAI/estimated-buy-amount/1000?atoms=false' | jq
{
  "baseTokenId": 1,
  "quoteTokenId": 7,
  "buyAmountInBase": "2.3573254925937595",
  "sellAmountInQuote": "1000"
}
$ curl -s 'http://localhost:8080/api/v1/markets/ETH-DAI/estimated-buy-amount/1000?atoms=false' | jq # Bonus!
{
  "baseTokenId": 1,
  "quoteTokenId": 7,
  "buyAmountInBase": "2.3573254925937595",
  "sellAmountInQuote": "1000"
}
```

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