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/beacon_block_streamer.rs

@@ -685,13 +685,13 @@ impl From<Error> for BeaconChainError {
 mod tests {
     use crate::beacon_block_streamer::{BeaconBlockStreamer, CheckCaches};
     use crate::test_utils::{BeaconChainHarness, EphemeralHarnessType, test_spec};
+    use bls::Keypair;
     use execution_layer::test_utils::Block;
+    use fixed_bytes::FixedBytesExtended;
     use std::sync::Arc;
     use std::sync::LazyLock;
     use tokio::sync::mpsc;
-    use types::{
-        ChainSpec, Epoch, EthSpec, FixedBytesExtended, Hash256, Keypair, MinimalEthSpec, Slot,
-    };
+    use types::{ChainSpec, Epoch, EthSpec, Hash256, MinimalEthSpec, Slot};
 
     const VALIDATOR_COUNT: usize = 48;