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/operation_pool/src/attestation.rs

@@ -1,12 +1,13 @@
 use crate::attestation_storage::{CompactAttestationRef, CompactIndexedAttestation};
 use crate::max_cover::MaxCover;
 use crate::reward_cache::RewardCache;
+use ssz::BitList;
 use state_processing::common::{
     attesting_indices_base::get_attesting_indices, base, get_attestation_participation_flag_indices,
 };
 use std::collections::HashMap;
 use types::{
-    Attestation, BeaconState, BitList, ChainSpec, EthSpec,
+    Attestation, BeaconState, ChainSpec, EthSpec,
     beacon_state::BeaconStateBase,
     consts::altair::{PARTICIPATION_FLAG_WEIGHTS, PROPOSER_WEIGHT, WEIGHT_DENOMINATOR},
 };