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/builder_client/src/lib.rs

@@ -1,9 +1,11 @@
+use bls::PublicKeyBytes;
+use context_deserialize::ContextDeserialize;
 pub use eth2::Error;
 use eth2::types::beacon_response::EmptyMetadata;
 use eth2::types::builder_bid::SignedBuilderBid;
 use eth2::types::{
-    ContentType, ContextDeserialize, EthSpec, ExecutionBlockHash, ForkName, ForkVersionDecode,
-    ForkVersionedResponse, PublicKeyBytes, SignedValidatorRegistrationData, Slot,
+    ContentType, EthSpec, ExecutionBlockHash, ForkName, ForkVersionDecode, ForkVersionedResponse,
+    SignedValidatorRegistrationData, Slot,
 };
 use eth2::types::{FullPayloadContents, SignedBlindedBeaconBlock};
 use eth2::{
@@ -538,9 +540,10 @@ impl BuilderHttpClient {
 #[cfg(test)]
 mod tests {
     use super::*;
+    use bls::Signature;
+    use eth2::types::MainnetEthSpec;
     use eth2::types::builder_bid::{BuilderBid, BuilderBidFulu};
     use eth2::types::test_utils::{SeedableRng, TestRandom, XorShiftRng};
-    use eth2::types::{MainnetEthSpec, Signature};
     use mockito::{Matcher, Server, ServerGuard};
 
     type E = MainnetEthSpec;