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>

consensus/state_processing/src/per_block_processing.rs

@@ -5,6 +5,7 @@ use safe_arith::{ArithError, SafeArith, SafeArithIter};
 use signature_sets::{block_proposal_signature_set, get_pubkey_from_state, randao_signature_set};
 use std::borrow::Cow;
 use tree_hash::TreeHash;
+use typenum::Unsigned;
 use types::*;
 
 pub use self::verify_attester_slashing::{