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_block_processing/altair/sync_committee.rs

@@ -1,12 +1,12 @@
 use crate::common::{altair::BaseRewardPerIncrement, decrease_balance, increase_balance};
 use crate::per_block_processing::errors::{BlockProcessingError, SyncAggregateInvalid};
 use crate::{VerifySignatures, signature_sets::sync_aggregate_signature_set};
+use bls::PublicKeyBytes;
 use safe_arith::SafeArith;
 use std::borrow::Cow;
+use typenum::Unsigned;
 use types::consts::altair::{PROPOSER_WEIGHT, SYNC_REWARD_WEIGHT, WEIGHT_DENOMINATOR};
-use types::{
-    BeaconState, BeaconStateError, ChainSpec, EthSpec, PublicKeyBytes, SyncAggregate, Unsigned,
-};
+use types::{BeaconState, BeaconStateError, ChainSpec, EthSpec, SyncAggregate};
 
 pub fn process_sync_aggregate<E: EthSpec>(
     state: &mut BeaconState<E>,