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/http_api/src/keystores.rs

@@ -1,5 +1,6 @@
 //! Implementation of the standard keystore management API.
 use account_utils::validator_definitions::PasswordStorage;
+use bls::PublicKeyBytes;
 use eth2::lighthouse_vc::{
     std_types::{
         DeleteKeystoreStatus, DeleteKeystoresRequest, DeleteKeystoresResponse,
@@ -18,7 +19,7 @@ use std::sync::Arc;
 use task_executor::TaskExecutor;
 use tokio::runtime::Handle;
 use tracing::{info, warn};
-use types::{EthSpec, PublicKeyBytes};
+use types::EthSpec;
 use validator_dir::{Builder as ValidatorDirBuilder, keystore_password_path};
 use warp::Rejection;
 use warp_utils::reject::{custom_bad_request, custom_server_error};