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>

validator_client/doppelganger_service/src/lib.rs

@@ -30,6 +30,7 @@
 //! Doppelganger protection is a best-effort, last-line-of-defence mitigation. Do not rely upon it.
 
 use beacon_node_fallback::BeaconNodeFallback;
+use bls::PublicKeyBytes;
 use environment::RuntimeContext;
 use eth2::types::LivenessResponseData;
 use logging::crit;
@@ -41,7 +42,7 @@ use std::sync::Arc;
 use task_executor::ShutdownReason;
 use tokio::time::sleep;
 use tracing::{error, info};
-use types::{Epoch, EthSpec, PublicKeyBytes, Slot};
+use types::{Epoch, EthSpec, Slot};
 use validator_store::{DoppelgangerStatus, ValidatorStore};
 
 struct LivenessResponses {