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/common/get_attesting_indices.rs

@@ -2,6 +2,7 @@ use types::*;
 
 pub mod attesting_indices_base {
     use crate::per_block_processing::errors::{AttestationInvalid as Invalid, BlockOperationError};
+    use ssz_types::{BitList, VariableList};
     use types::*;
 
     /// Convert `attestation` to (almost) indexed-verifiable form.
@@ -44,10 +45,10 @@ pub mod attesting_indices_base {
 }
 
 pub mod attesting_indices_electra {
-    use std::collections::HashSet;
-
     use crate::per_block_processing::errors::{AttestationInvalid as Invalid, BlockOperationError};
     use safe_arith::SafeArith;
+    use ssz_types::{BitList, BitVector, VariableList};
+    use std::collections::HashSet;
     use types::*;
 
     /// Compute an Electra IndexedAttestation given a list of committees.

consensus/state_processing/src/common/slash_validator.rs

@@ -6,6 +6,7 @@ use crate::{
 };
 use safe_arith::SafeArith;
 use std::cmp;
+use typenum::Unsigned;
 use types::{
     consts::altair::{PROPOSER_WEIGHT, WEIGHT_DENOMINATOR},
     *,