gnosis / dex-services / 4627

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travis-pro

Port pricegraph `fetch` data script to Rust (#1271)

To completely remove NodeJS requirement, migrate `pricegraph-data` scripts from JS to Rust. It turns out that with `ethcontract` and the `contracts` crate, it is relatively easy!

### Test Plan

It takes FOREVER to download the full orderbook, for a quick test, download a few pages:
```
$ INFURA_PROJECT_ID=... cargo run -p pricegraph-data --bin fetch
[2020-08-10T07:45:09Z INFO  fetch] retrieving orderbook at block 10630913 until batch 5323483
[2020-08-10T07:45:09Z INFO  fetch] retrieving orderbook at block 10630913 until batch 5323484
[2020-08-10T07:45:09Z DEBUG fetch] retrieving page 0x0000…0000-0
[2020-08-10T07:45:10Z DEBUG fetch] retrieving page 0x7b2e…a196-24
[2020-08-10T07:45:11Z DEBUG fetch] retrieving page 0xb738…a513-10
^C
```

Then inspect that the newly created encoded orderbook file matches the format of an existing one:
```
$ cat orderbook-5323483.hex | head -n 1
<a class=hub.com/gnosis/dex-services/commit/2e173510024d480d195d8875e4d55e9b6198b654">2e1735100 <a class=hub.com/gnosis/dex-services/commit/0000000000000000000000000000000000000000">000000000000001b008d6014628154509 000a 0000 00507ef5 ffffffff 0000000000000a968163f0a57b400000 00000000000000004563918244f40000 00000000000000004563918244f40000 0004
$ cat orderbook-5298183.hex | head -n 1
2e173510024d480d195d8875e4d55e9b6198b654 00000000000000000000000000000000000000000000000116860e2e71f33d91 000a 0000 00507ef5 ffffffff 0000000000000a968163f0a57b400000 00000000000000004563918244f40000 00000000000000004563918244f40000 0004
```

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