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>

validator_client/http_api/src/tests/keystores.rs

@@ -1,19 +1,23 @@
 use super::*;
 use account_utils::random_password_string;
 use bls::PublicKeyBytes;
+use bls::{AggregateSignature, PublicKey};
 use eth2::lighthouse_vc::types::UpdateFeeRecipientRequest;
 use eth2::lighthouse_vc::{
     http_client::ValidatorClientHttpClient as HttpClient,
     std_types::{KeystoreJsonStr as Keystore, *},
     types::Web3SignerValidatorRequest,
 };
+use fixed_bytes::FixedBytesExtended;
 use itertools::Itertools;
 use lighthouse_validator_store::DEFAULT_GAS_LIMIT;
 use rand::rngs::StdRng;
 use rand::{Rng, SeedableRng};
 use slashing_protection::interchange::{Interchange, InterchangeMetadata};
+use ssz_types::BitList;
 use std::{collections::HashMap, path::Path};
 use tokio::runtime::Handle;
+use typenum::Unsigned;
 use types::{Address, attestation::AttestationBase};
 use validator_store::ValidatorStore;
 use zeroize::Zeroizing;