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/store/src/config.rs

@@ -1,5 +1,4 @@
 use crate::hdiff::HierarchyConfig;
-use crate::superstruct;
 use crate::{DBColumn, Error, StoreItem};
 use serde::{Deserialize, Serialize};
 use ssz::{Decode, Encode};
@@ -7,6 +6,7 @@ use ssz_derive::{Decode, Encode};
 use std::io::{Read, Write};
 use std::num::NonZeroUsize;
 use strum::{Display, EnumString, EnumVariantNames};
+use superstruct::superstruct;
 use types::EthSpec;
 use types::non_zero_usize::new_non_zero_usize;
 use zstd::{Decoder, Encoder};