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>

account_manager/src/validator/slashing_protection.rs

@@ -1,3 +1,4 @@
+use bls::PublicKeyBytes;
 use clap::{Arg, ArgAction, ArgMatches, Command};
 use environment::Environment;
 use slashing_protection::{
@@ -7,7 +8,7 @@ use slashing_protection::{
 use std::fs::File;
 use std::path::PathBuf;
 use std::str::FromStr;
-use types::{Epoch, EthSpec, PublicKeyBytes, Slot};
+use types::{Epoch, EthSpec, Slot};
 
 pub const CMD: &str = "slashing-protection";
 pub const IMPORT_CMD: &str = "import";