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/initialized_validators/src/lib.rs

@@ -15,6 +15,7 @@ use account_utils::{
         Web3SignerDefinition,
     },
 };
+use bls::{Keypair, PublicKey, PublicKeyBytes};
 use eth2_keystore::Keystore;
 use lockfile::{Lockfile, LockfileError};
 use metrics::set_gauge;
@@ -30,7 +31,7 @@ use std::sync::Arc;
 use std::time::Duration;
 use tracing::{debug, error, info, warn};
 use types::graffiti::GraffitiString;
-use types::{Address, Graffiti, Keypair, PublicKey, PublicKeyBytes};
+use types::{Address, Graffiti};
 use url::{ParseError, Url};
 use validator_dir::Builder as ValidatorDirBuilder;
 use zeroize::Zeroizing;