gnosis / dex-services / 4597

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Vendor artifacts (#1263)

Fixes #846 and closes #1257  

This PR adds a `contracts/src/bin/vendor.rs` script for vendoring Truffle artifact JSON files.
Additionally, these artifacts are vendored and used instead of building with Truffle.

One thing I'm not fond about vendoring is the JSON artifact files are **HUGE**. So, we also prune the JSON files a bit, only including what is used by `ethcontract`:
```
{
  abi,
  contractName,
  bytecode,
  networks,
  devdoc,
  userdoc,
}
```

This would reduce:
```
$ du -h contracts/artifacts # Before pruning
5.5M	contracts/artifacts
$ du -h contracts/artifacts # After pruning, size reduced by 97%!
172K	contracts/artifacts
```

### Test Plan

CI, and :crossed_fingers: that master won't break :see_no_evil: 

Also, run the vendor script and see no modifications:
```
$ (cd contracts; cargo run --bin vendor --features bin)
   Compiling contracts v0.1.0 (/var/home/nlordell/Developer/gnosis/dex-services/contracts)
    Finished dev [unoptimized + debuginfo] target(s) in 6.56s
     Running `/var/home/nlordell/Developer/gnosis/dex-services/target/debug/vendor`
[2020-08-06T21:42:28Z INFO  vendor] vendoring contract artifacts to '/var/home/nlordell/Developer/gnosis/dex-services/contracts/artifacts'
[2020-08-06T21:42:28Z INFO  vendor] retrieving BatchExchange from @gnosis.pm/dex-contracts@0.4.1
[2020-08-06T21:42:30Z INFO  vendor] retrieving BatchExchangeViewer from @gnosis.pm/dex-contracts@0.4.1
[2020-08-06T21:42:32Z INFO  vendor] retrieving TokenOWL from @gnosis.pm/owl-token@3.1.0
[2020-08-06T21:42:32Z INFO  vendor] retrieving TokenOWLProxy from @gnosis.pm/owl-token@3.1.0
[2020-08-06T21:42:32Z INFO  vendor] retrieving IdToAddressBiMap from @gnosis.pm/solidity-data-structures@1.2.4
[2020-08-06T21:42:33Z INFO  vendor] retrieving IterableAppendOnlySet from @gnosis.pm/solidity-data-structures@1.2.4
[2020-08-06T21:42:33Z INFO  vendor] retrieving ERC20Mintable from @openzeppelin/contracts... (continued)

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