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Implement `arg_enum` macro (#1413)

This PR adds an `arg_enum` style macro for so we don't have to manually implement `FromStr` and `variants` for argument enums. This is done since it is a fairly simple macro and so we don't have to pull in `clap` into `services-core`.

### Test Plan

Check that the new arguments parse correctly:
```
$ cargo run -p driver -- --solver-type BestRingSolver --solver-internal-optimizer Gurobi --scheduler Evm
    Finished dev [unoptimized + debuginfo] target(s) in 0.13s
     Running `target/debug/driver --solver-type BestRingSolver --solver-internal-optimizer Gurobi --scheduler Evm`
2020-09-09T04:45:26.574Z INFO [driver] Starting driver with runtime options: Options {
    ...
    solver_type: BestRingSolver,
    solver_internal_optimizer: Gurobi,
    ...
    scheduler: Evm,
    ...
}
```

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