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/beacon_chain/src/graffiti_calculator.rs

@@ -225,13 +225,14 @@ async fn engine_version_cache_refresh_service<T: BeaconChainTypes>(
 mod tests {
     use crate::ChainConfig;
     use crate::test_utils::{BeaconChainHarness, EphemeralHarnessType, test_spec};
+    use bls::Keypair;
     use execution_layer::EngineCapabilities;
     use execution_layer::test_utils::{DEFAULT_CLIENT_VERSION, DEFAULT_ENGINE_CAPABILITIES};
     use std::sync::Arc;
     use std::sync::LazyLock;
     use std::time::Duration;
     use tracing::info;
-    use types::{ChainSpec, GRAFFITI_BYTES_LEN, Graffiti, Keypair, MinimalEthSpec};
+    use types::{ChainSpec, GRAFFITI_BYTES_LEN, Graffiti, MinimalEthSpec};
 
     const VALIDATOR_COUNT: usize = 48;
     /// A cached set of keys.