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/state_processing/src/per_epoch_processing/single_pass.rs

@@ -8,19 +8,20 @@ use crate::{
     per_epoch_processing::{Delta, Error, ParticipationEpochSummary},
 };
 use itertools::izip;
+use milhouse::{Cow, List, Vector};
 use safe_arith::{SafeArith, SafeArithIter};
 use std::cmp::{max, min};
 use std::collections::{BTreeSet, HashMap};
 use tracing::instrument;
+use typenum::Unsigned;
 use types::{
     ActivationQueue, BeaconState, BeaconStateError, ChainSpec, Checkpoint, DepositData, Epoch,
-    EthSpec, ExitCache, ForkName, List, ParticipationFlags, PendingDeposit,
-    ProgressiveBalancesCache, RelativeEpoch, Unsigned, Validator, Vector,
+    EthSpec, ExitCache, ForkName, ParticipationFlags, PendingDeposit, ProgressiveBalancesCache,
+    RelativeEpoch, Validator,
     consts::altair::{
         NUM_FLAG_INDICES, PARTICIPATION_FLAG_WEIGHTS, TIMELY_HEAD_FLAG_INDEX,
         TIMELY_TARGET_FLAG_INDEX, WEIGHT_DENOMINATOR,
     },
-    milhouse::Cow,
 };
 
 pub struct SinglePassConfig {