gnosis / dex-services / 4956

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travis-pro

Handle block queries (#1357)

Fixes #1272.

This PR adds code to handle the `blockNUmber` price estimate queries and use the orderbook at the specified block.

### Test Plan

Start the price estimator and look into the past!
```
$ curl -s 'http://localhost:8080/api/v1/markets/ETH-USDC/estimated-best-ask-price?blockNumber=10000000' | jq
202.9252312603078
$ curl -s 'http://localhost:8080/api/v1/markets/ETH-USDC/estimated-best-ask-price' | jq                     
351.9815151148865
```

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