Add eip_3076 crate (#8206)

#7894


  Moves the `Interchange` format from `slashing_protection` and thus removes the dependency on `slashing_protection` from `eth2` which can now just depend on the slimmer `eip_3076` crate.


Co-Authored-By: Mac L <mjladson@pm.me>

Cargo.lock

@@ -2581,6 +2581,18 @@ dependencies = [
  "sha2 0.10.8",
 ]
 
+[[package]]
+name = "eip_3076"
+version = "0.1.0"
+dependencies = [
+ "arbitrary",
+ "ethereum_serde_utils",
+ "serde",
+ "serde_json",
+ "tempfile",
+ "types",
+]
+
 [[package]]
 name = "either"
 version = "1.15.0"
@@ -2848,6 +2860,7 @@ name = "eth2"
 version = "0.1.0"
 dependencies = [
  "derivative",
+ "eip_3076",
  "either",
  "enr",
  "eth2_keystore",
@@ -2867,7 +2880,6 @@ dependencies = [
  "sensitive_url",
  "serde",
  "serde_json",
- "slashing_protection",
  "ssz_types",
  "test_random_derive",
  "tokio",
@@ -8832,6 +8844,7 @@ name = "slashing_protection"
 version = "0.1.0"
 dependencies = [
  "arbitrary",
+ "eip_3076",
  "ethereum_serde_utils",
  "filesystem",
  "r2d2",