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/tests/validator_monitor.rs

@@ -2,8 +2,9 @@ use beacon_chain::test_utils::{
     AttestationStrategy, BeaconChainHarness, BlockStrategy, EphemeralHarnessType,
 };
 use beacon_chain::validator_monitor::{MISSED_BLOCK_LAG_SLOTS, ValidatorMonitorConfig};
+use bls::{Keypair, PublicKeyBytes};
 use std::sync::LazyLock;
-use types::{Epoch, EthSpec, Hash256, Keypair, MainnetEthSpec, PublicKeyBytes, Slot};
+use types::{Epoch, EthSpec, Hash256, MainnetEthSpec, Slot};
 
 // Should ideally be divisible by 3.
 pub const VALIDATOR_COUNT: usize = 48;