gnosis / dex-services / 4702

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travis-pro

Block number and timestamp query parameters (#1288)

This PR is the first step to #1272 and introduces new query parameters. They are currently not supported by the service and return internal server errors.

### Test Plan

See that the parameter causes a `internal server error` instead of a `invalid url query`.
```
$ cargo run -p price-estimator
...
$ curl -s 'http://localhost:8080/api/v1/markets/7-1/estimated-buy-amount/1?blockNumber=1337' | jq
{
  "message": "internal server error"
}
```

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