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.

common/eth2/src/lighthouse_vc/http_client.rs

@@ -57,7 +57,7 @@ pub fn parse_pubkey(secret: &str) -> Result<Option<PublicKey>, Error> {
         &secret[SECRET_PREFIX.len()..]
     };
 
-    eth2_serde_utils::hex::decode(secret)
+    serde_utils::hex::decode(secret)
         .map_err(|e| Error::InvalidSecret(format!("invalid hex: {:?}", e)))
         .and_then(|bytes| {
             if bytes.len() != PK_LEN {
@@ -174,7 +174,7 @@ impl ValidatorClientHttpClient {
         let message =
             Message::parse_slice(digest(&SHA256, &body).as_ref()).expect("sha256 is 32 bytes");
 
-        eth2_serde_utils::hex::decode(&sig)
+        serde_utils::hex::decode(&sig)
             .ok()
             .and_then(|bytes| {
                 let sig = Signature::parse_der(&bytes).ok()?;

common/eth2/src/lighthouse_vc/std_types.rs

@@ -13,7 +13,7 @@ pub struct GetFeeRecipientResponse {
 #[derive(Debug, Deserialize, Serialize, PartialEq)]
 pub struct GetGasLimitResponse {
     pub pubkey: PublicKeyBytes,
-    #[serde(with = "eth2_serde_utils::quoted_u64")]
+    #[serde(with = "serde_utils::quoted_u64")]
     pub gas_limit: u64,
 }
 
@@ -45,7 +45,7 @@ pub struct ImportKeystoresRequest {
 
 #[derive(Debug, Clone, PartialEq, Deserialize, Serialize)]
 #[serde(transparent)]
-pub struct KeystoreJsonStr(#[serde(with = "eth2_serde_utils::json_str")] pub Keystore);
+pub struct KeystoreJsonStr(#[serde(with = "serde_utils::json_str")] pub Keystore);
 
 impl std::ops::Deref for KeystoreJsonStr {
     type Target = Keystore;
@@ -56,7 +56,7 @@ impl std::ops::Deref for KeystoreJsonStr {
 
 #[derive(Debug, Clone, PartialEq, Deserialize, Serialize)]
 #[serde(transparent)]
-pub struct InterchangeJsonStr(#[serde(with = "eth2_serde_utils::json_str")] pub Interchange);
+pub struct InterchangeJsonStr(#[serde(with = "serde_utils::json_str")] pub Interchange);
 
 #[derive(Debug, Deserialize, Serialize)]
 pub struct ImportKeystoresResponse {
@@ -103,7 +103,7 @@ pub struct DeleteKeystoresRequest {
 #[derive(Debug, Deserialize, Serialize)]
 pub struct DeleteKeystoresResponse {
     pub data: Vec<Status<DeleteKeystoreStatus>>,
-    #[serde(with = "eth2_serde_utils::json_str")]
+    #[serde(with = "serde_utils::json_str")]
     pub slashing_protection: Interchange,
 }
 

common/eth2/src/lighthouse_vc/types.rs

@@ -32,14 +32,14 @@ pub struct ValidatorRequest {
     #[serde(default)]
     #[serde(skip_serializing_if = "Option::is_none")]
     pub builder_proposals: Option<bool>,
-    #[serde(with = "eth2_serde_utils::quoted_u64")]
+    #[serde(with = "serde_utils::quoted_u64")]
     pub deposit_gwei: u64,
 }
 
 #[derive(Clone, PartialEq, Serialize, Deserialize)]
 pub struct CreateValidatorsMnemonicRequest {
     pub mnemonic: ZeroizeString,
-    #[serde(with = "eth2_serde_utils::quoted_u32")]
+    #[serde(with = "serde_utils::quoted_u32")]
     pub key_derivation_path_offset: u32,
     pub validators: Vec<ValidatorRequest>,
 }
@@ -62,7 +62,7 @@ pub struct CreatedValidator {
     #[serde(skip_serializing_if = "Option::is_none")]
     pub builder_proposals: Option<bool>,
     pub eth1_deposit_tx_data: String,
-    #[serde(with = "eth2_serde_utils::quoted_u64")]
+    #[serde(with = "serde_utils::quoted_u64")]
     pub deposit_gwei: u64,
 }
 
@@ -141,7 +141,7 @@ pub struct UpdateFeeRecipientRequest {
 
 #[derive(Debug, Clone, PartialEq, Deserialize, Serialize)]
 pub struct UpdateGasLimitRequest {
-    #[serde(with = "eth2_serde_utils::quoted_u64")]
+    #[serde(with = "serde_utils::quoted_u64")]
     pub gas_limit: u64,
 }