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/lib.rs

@@ -19,10 +19,11 @@ pub use crate::slashing_database::{
     InterchangeError, InterchangeImportOutcome, SUPPORTED_INTERCHANGE_FORMAT_VERSION,
     SlashingDatabase,
 };
+use bls::PublicKeyBytes;
 use rusqlite::Error as SQLError;
 use std::fmt::Display;
 use std::io::{Error as IOError, ErrorKind};
-use types::{Hash256, PublicKeyBytes};
+use types::Hash256;
 
 /// The filename within the `validators` directory that contains the slashing protection DB.
 pub const SLASHING_PROTECTION_FILENAME: &str = "slashing_protection.sqlite";
@@ -133,7 +134,7 @@ impl Display for NotSafe {
 
 #[cfg(test)]
 mod test {
-    use types::FixedBytesExtended;
+    use fixed_bytes::FixedBytesExtended;
 
     use super::*;