gnosis / dex-services / 5026

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move benchmarking to its own crate (#1390)

The PR refactors the benchmarking into its own crate (just like the `fuzz`-ing). The motivations are two-fold:
- `cargo test -p pricegraph` no longer needs to build `criterion` (which it didn't use).
- `cargo bench` builds in `release` with `test` configuration enabled but the `criterion` benchmark binary links with `release` build without `test` enabled - this means that the deterministic `Map` from #1388 doesn't work as expected with `cargo bench`. Moving to a separate crate allows us to define a `bench` feature that enables the deterministic `Map`.

In order to share the test data a bit better, it was moved into a separate crate instead of just being a source file that gets pulled in with:
```
#[path = "..."]
mod data
```

### Test Plan

```
cargo bench -p pricegraph-bench
```

Also, check that fuzzing still works since the `features` were slightly reworked:
```
cargo +nightly fuzz pricegraph
```

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