Split common crates out into their own repos (#3890)

## Proposed Changes

Split out several crates which now exist in separate repos under `sigp`.

- [`ssz` and `ssz_derive`](https://github.com/sigp/ethereum_ssz)
- [`tree_hash` and `tree_hash_derive`](https://github.com/sigp/tree_hash)
- [`ethereum_hashing`](https://github.com/sigp/ethereum_hashing)
- [`ethereum_serde_utils`](https://github.com/sigp/ethereum_serde_utils)
- [`ssz_types`](https://github.com/sigp/ssz_types)

For the published crates see: https://crates.io/teams/github:sigp:crates-io?sort=recent-updates.

## Additional Info

- [x] Need to work out how to handle versioning. I was hoping to do 1.0 versions of several crates, but if they depend on `ethereum-types 0.x` that is not going to work. EDIT: decided to go with 0.5.x versions.
- [x] Need to port several changes from `tree-states`, `capella`, `eip4844` branches to the external repos.

consensus/state_processing/Cargo.toml

@@ -13,15 +13,15 @@ tokio = { version = "1.14.0", features = ["rt-multi-thread"] }
 bls = { path = "../../crypto/bls" }
 integer-sqrt = "0.1.5"
 itertools = "0.10.0"
-eth2_ssz = "0.4.1"
-eth2_ssz_derive = "0.3.1"
-eth2_ssz_types = "0.2.2"
+ethereum_ssz = "0.5.0"
+ethereum_ssz_derive = "0.5.0"
+ssz_types = "0.5.0"
 merkle_proof = { path = "../merkle_proof" }
 safe_arith = { path = "../safe_arith" }
-tree_hash = "0.4.1"
+tree_hash = "0.5.0"
 types = { path = "../types", default-features = false }
 rayon = "1.4.1"
-eth2_hashing = "0.3.0"
+ethereum_hashing = "1.0.0-beta.2"
 int_to_bytes = { path = "../int_to_bytes" }
 smallvec = "1.6.1"
 arbitrary = { version = "1.0", features = ["derive"], optional = true }
@@ -39,7 +39,7 @@ arbitrary-fuzz = [
   "types/arbitrary-fuzz",
   "bls/arbitrary",
   "merkle_proof/arbitrary",
-  "eth2_ssz/arbitrary",
-  "eth2_ssz_types/arbitrary",
+  "ethereum_ssz/arbitrary",
+  "ssz_types/arbitrary",
   "tree_hash/arbitrary",
 ]

consensus/state_processing/src/common/deposit_data_tree.rs

@@ -1,4 +1,4 @@
-use eth2_hashing::hash;
+use ethereum_hashing::hash;
 use int_to_bytes::int_to_bytes32;
 use merkle_proof::{MerkleTree, MerkleTreeError};
 use safe_arith::SafeArith;

consensus/state_processing/src/per_block_processing/verify_bls_to_execution_change.rs

@@ -1,7 +1,7 @@
 use super::errors::{BlockOperationError, BlsExecutionChangeInvalid as Invalid};
 use crate::per_block_processing::signature_sets::bls_execution_change_signature_set;
 use crate::VerifySignatures;
-use eth2_hashing::hash;
+use ethereum_hashing::hash;
 use types::*;
 
 type Result<T> = std::result::Result<T, BlockOperationError<Invalid>>;