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/remotekeys.rs

@@ -2,6 +2,7 @@
 use account_utils::validator_definitions::{
     SigningDefinition, ValidatorDefinition, Web3SignerDefinition,
 };
+use bls::PublicKeyBytes;
 use eth2::lighthouse_vc::std_types::{
     DeleteRemotekeyStatus, DeleteRemotekeysRequest, DeleteRemotekeysResponse,
     ImportRemotekeyStatus, ImportRemotekeysRequest, ImportRemotekeysResponse,
@@ -14,7 +15,7 @@ use std::sync::Arc;
 use task_executor::TaskExecutor;
 use tokio::runtime::Handle;
 use tracing::{info, warn};
-use types::{EthSpec, PublicKeyBytes};
+use types::EthSpec;
 use url::Url;
 use warp::Rejection;
 use warp_utils::reject::custom_server_error;