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_manager/src/create_validators.rs

@@ -1,6 +1,7 @@
 use super::common::*;
 use crate::DumpConfig;
 use account_utils::{random_password_string, read_mnemonic_from_cli, read_password_from_user};
+use bls::PublicKeyBytes;
 use clap::{Arg, ArgAction, ArgMatches, Command};
 use clap_utils::FLAG_HEADER;
 use eth2::{
@@ -586,6 +587,7 @@ async fn run<E: EthSpec>(config: CreateConfig, spec: &ChainSpec) -> Result<(), S
 #[cfg(test)]
 pub mod tests {
     use super::*;
+    use bls::SignatureBytes;
     use eth2_network_config::Eth2NetworkConfig;
     use regex::Regex;
     use std::path::Path;