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>

validator_client/slashing_protection/src/interchange_test.rs

@@ -2,11 +2,13 @@ use crate::{
     SigningRoot, SlashingDatabase,
     test_utils::{DEFAULT_GENESIS_VALIDATORS_ROOT, pubkey},
 };
+use bls::PublicKeyBytes;
 use eip_3076::{Interchange, SignedAttestation, SignedBlock};
+use fixed_bytes::FixedBytesExtended;
 use serde::{Deserialize, Serialize};
 use std::collections::HashSet;
 use tempfile::tempdir;
-use types::{Epoch, FixedBytesExtended, Hash256, PublicKeyBytes, Slot};
+use types::{Epoch, Hash256, Slot};
 
 #[derive(Debug, Clone, Deserialize, Serialize)]
 #[cfg_attr(feature = "arbitrary-fuzz", derive(arbitrary::Arbitrary))]