Remove consensus/types re-exports (#8540)

There are certain crates which we re-export within `types` which creates a fragmented DevEx, where there are various ways to import the same crates.

```rust
// consensus/types/src/lib.rs
pub use bls::{
AggregatePublicKey, AggregateSignature, Error as BlsError, Keypair, PUBLIC_KEY_BYTES_LEN,
PublicKey, PublicKeyBytes, SIGNATURE_BYTES_LEN, SecretKey, Signature, SignatureBytes,
get_withdrawal_credentials,
};
pub use context_deserialize::{ContextDeserialize, context_deserialize};
pub use fixed_bytes::FixedBytesExtended;
pub use milhouse::{self, List, Vector};
pub use ssz_types::{BitList, BitVector, FixedVector, VariableList, typenum, typenum::Unsigned};
pub use superstruct::superstruct;
```

This PR removes these re-exports and makes it explicit that these types are imported from a non-`consensus/types` crate.


Co-Authored-By: Mac L <mjladson@pm.me>

lighthouse/tests/account_manager.rs

@@ -18,6 +18,7 @@ use account_utils::{
     eth2_keystore::KeystoreBuilder,
     validator_definitions::{SigningDefinition, ValidatorDefinition, ValidatorDefinitions},
 };
+use bls::{Keypair, PublicKey};
 use slashing_protection::{SLASHING_PROTECTION_FILENAME, SlashingDatabase};
 use std::env;
 use std::fs::{self, File};
@@ -26,7 +27,6 @@ use std::path::{Path, PathBuf};
 use std::process::{Child, Command, Output, Stdio};
 use std::str::from_utf8;
 use tempfile::{TempDir, tempdir};
-use types::{Keypair, PublicKey};
 use validator_dir::ValidatorDir;
 use zeroize::Zeroizing;
 

lighthouse/tests/validator_manager.rs

@@ -1,3 +1,4 @@
+use bls::PublicKeyBytes;
 use eth2::SensitiveUrl;
 use serde::de::DeserializeOwned;
 use std::fs;