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>

consensus/fork_choice/src/fork_choice.rs

@@ -1,5 +1,6 @@
 use crate::metrics::{self, scrape_for_metrics};
 use crate::{ForkChoiceStore, InvalidationOperation};
+use fixed_bytes::FixedBytesExtended;
 use logging::crit;
 use proto_array::{
     Block as ProtoBlock, DisallowedReOrgOffsets, ExecutionStatus, JustifiedBalances,
@@ -19,7 +20,7 @@ use tracing::{debug, instrument, warn};
 use types::{
     AbstractExecPayload, AttestationShufflingId, AttesterSlashingRef, BeaconBlockRef, BeaconState,
     BeaconStateError, ChainSpec, Checkpoint, Epoch, EthSpec, ExecPayload, ExecutionBlockHash,
-    FixedBytesExtended, Hash256, IndexedAttestationRef, RelativeEpoch, SignedBeaconBlock, Slot,
+    Hash256, IndexedAttestationRef, RelativeEpoch, SignedBeaconBlock, Slot,
     consts::bellatrix::INTERVALS_PER_SLOT,
 };