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>

beacon_node/src/config.rs

@@ -6,6 +6,7 @@ use beacon_chain::chain_config::{
 };
 use beacon_chain::custody_context::NodeCustodyType;
 use beacon_chain::graffiti_calculator::GraffitiOrigin;
+use bls::PublicKeyBytes;
 use clap::{ArgMatches, Id, parser::ValueSource};
 use clap_utils::flags::DISABLE_MALLOC_TUNING_FLAG;
 use clap_utils::{parse_flag, parse_required};
@@ -29,7 +30,7 @@ use std::str::FromStr;
 use std::time::Duration;
 use tracing::{error, info, warn};
 use types::graffiti::GraffitiString;
-use types::{Checkpoint, Epoch, EthSpec, Hash256, PublicKeyBytes};
+use types::{Checkpoint, Epoch, EthSpec, Hash256};
 
 const PURGE_DB_CONFIRMATION: &str = "confirm";