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/validator_store/src/lib.rs

@@ -1,3 +1,4 @@
+use bls::{PublicKeyBytes, Signature};
 use eth2::types::{FullBlockContents, PublishBlockRequest};
 use slashing_protection::NotSafe;
 use std::fmt::Debug;
@@ -5,9 +6,9 @@ use std::future::Future;
 use std::sync::Arc;
 use types::{
     Address, Attestation, AttestationError, BlindedBeaconBlock, Epoch, EthSpec, Graffiti, Hash256,
-    PublicKeyBytes, SelectionProof, Signature, SignedAggregateAndProof, SignedBlindedBeaconBlock,
-    SignedContributionAndProof, SignedValidatorRegistrationData, Slot, SyncCommitteeContribution,
-    SyncCommitteeMessage, SyncSelectionProof, SyncSubnetId, ValidatorRegistrationData,
+    SelectionProof, SignedAggregateAndProof, SignedBlindedBeaconBlock, SignedContributionAndProof,
+    SignedValidatorRegistrationData, Slot, SyncCommitteeContribution, SyncCommitteeMessage,
+    SyncSelectionProof, SyncSubnetId, ValidatorRegistrationData,
 };
 
 #[derive(Debug, PartialEq, Clone)]