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/network/src/sync/block_lookups/parent_chain.rs

@@ -118,7 +118,8 @@ pub(crate) fn find_oldest_fork_ancestor(
 #[cfg(test)]
 mod tests {
     use super::{Node, compute_parent_chains, find_oldest_fork_ancestor};
-    use types::{FixedBytesExtended, Hash256};
+    use fixed_bytes::FixedBytesExtended;
+    use types::Hash256;
 
     fn h(n: u64) -> Hash256 {
         Hash256::from_low_u64_be(n)