Add toledo support (#1874)

## Issue Addressed

NA

## Proposed Changes

Adds support for the [Toledo](https://github.com/protolambda/toledo) dev-net.

```bash
lighthouse --testnet toledo bn --http
```

This is for development only, we do not recommend users to join this testnet.

## Additional Info

- ~~Blocked on #1862~~

consensus/types/src/chain_spec.rs

@@ -598,6 +598,7 @@ impl YamlConfig {
         Some(match self.config_name.as_str() {
             "mainnet" => EthSpecId::Mainnet,
             "minimal" => EthSpecId::Minimal,
+            "toledo" => EthSpecId::Mainnet,
             "zinken" => EthSpecId::V012Legacy,
             "spadina" => EthSpecId::V012Legacy,
             "medalla" => EthSpecId::V012Legacy,