Anchor pre-PR: Decouple eth2 (#6770)

* decouple `eth2` from `store` and `lighthouse_network`

Co-authored-by: Pawan Dhananjay <pawandhananjay@gmail.com>

* remove unused dependency

---------

Co-authored-by: Pawan Dhananjay <pawandhananjay@gmail.com>
Co-authored-by: Jimmy Chen <jimmy@sigmaprime.io>

Cargo.lock

@@ -2563,14 +2563,16 @@ name = "eth2"
 version = "0.1.0"
 dependencies = [
  "derivative",
+ "enr",
  "eth2_keystore",
  "ethereum_serde_utils",
  "ethereum_ssz",
  "ethereum_ssz_derive",
  "futures",
  "futures-util",
- "lighthouse_network",
+ "libp2p-identity",
  "mediatype",
+ "multiaddr",
  "pretty_reqwest_error",
  "procfs",
  "proto_array",
@@ -2582,7 +2584,6 @@ dependencies = [
  "serde_json",
  "slashing_protection",
  "ssz_types",
- "store",
  "tokio",
  "types",
  "zeroize",
@@ -3023,7 +3024,6 @@ dependencies = [
  "builder_client",
  "bytes",
  "eth2",
- "eth2_network_config",
  "ethereum_serde_utils",
  "ethereum_ssz",
  "ethers-core",
@@ -5314,6 +5314,7 @@ dependencies = [
  "dirs",
  "discv5",
  "either",
+ "eth2",
  "ethereum_ssz",
  "ethereum_ssz_derive",
  "fnv",