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/tests/migration.rs

@@ -1,10 +1,11 @@
 //! Tests for upgrading a previous version of the database to the latest schema.
+use fixed_bytes::FixedBytesExtended;
 use slashing_protection::{NotSafe, SlashingDatabase};
 use std::collections::HashMap;
 use std::fs;
 use std::path::{Path, PathBuf};
 use tempfile::tempdir;
-use types::{FixedBytesExtended, Hash256};
+use types::Hash256;
 
 fn test_data_dir() -> PathBuf {
     Path::new(&std::env::var("CARGO_MANIFEST_DIR").unwrap()).join("migration-tests")