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>

beacon_node/http_api/src/validator/mod.rs

@@ -9,6 +9,7 @@ use crate::{StateId, attester_duties, proposer_duties, sync_committees};
 use beacon_chain::attestation_verification::VerifiedAttestation;
 use beacon_chain::validator_monitor::timestamp_now;
 use beacon_chain::{AttestationError, BeaconChain, BeaconChainError, BeaconChainTypes};
+use bls::PublicKeyBytes;
 use eth2::StatusCode;
 use eth2::types::{
     Accept, BeaconCommitteeSubscription, EndpointVersion, Failure, GenericResponse,
@@ -23,7 +24,7 @@ use tokio::sync::mpsc::{Sender, UnboundedSender};
 use tokio::sync::oneshot;
 use tracing::{debug, error, info, warn};
 use types::{
-    BeaconState, Epoch, EthSpec, ProposerPreparationData, PublicKeyBytes, SignedAggregateAndProof,
+    BeaconState, Epoch, EthSpec, ProposerPreparationData, SignedAggregateAndProof,
     SignedContributionAndProof, SignedValidatorRegistrationData, Slot, SyncContributionData,
     ValidatorSubscription,
 };