gnosis / dex-services / 4629

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travis-pro

Port pricegraph `convert` script to Rust (#1278)

Closes #1259 

Continues what was started with #1271 and oxidizes the `convert` script.

### Test Plan

Download and instance file and:
```
$ git checkout master
$ (cd pricegraph/data; yarn && yarn convert path/to/instance.json 123)
...
Done in 0.52s.
$ git checkout pricegraph-data-convert-rust
$ cargo run -p pricegraph-data --bin convert -- target/instance.json 456
   Compiling contracts v0.1.0 (/var/home/nlordell/Developer/gnosis/dex-services/contracts)
   Compiling pricegraph-data v0.0.0 (/var/home/nlordell/Developer/gnosis/dex-services/pricegraph/data)
    Finished dev [unoptimized + debuginfo] target(s) in 4.54s
     Running `target/debug/convert target/instance.json 456`
[2020-08-10T11:45:21Z INFO  convert] encoding 13766 orders from `target/instance.json`
$ diff pricegraph/data/orderbook-123.hex pricegraph/data/orderbook-456.hex | diffstat
 0 files changed
```

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