Modularize validator store (#6705)

- Create trait `ValidatorStore` with all functions used by the `validator_services`
- Make `validator_services` generic on `S: ValidatorStore`
- Introduce `LighthouseValidatorStore`, which has identical functionality to the old `ValidatorStore`
- Remove dependencies (especially `environment`) from `validator_services` and `beacon_node_fallback` in order to be able to cleanly use them in Anchor

Cargo.lock

@@ -879,14 +879,13 @@ name = "beacon_node_fallback"
 version = "0.1.0"
 dependencies = [
  "clap",
- "environment",
  "eth2",
  "futures",
  "itertools 0.10.5",
- "logging",
  "serde",
  "slot_clock",
  "strum",
+ "task_executor",
  "tokio",
  "tracing",
  "types",
@@ -2364,6 +2363,7 @@ dependencies = [
  "tokio",
  "tracing",
  "types",
+ "validator_store",
 ]
 
 [[package]]
@@ -5635,6 +5635,32 @@ dependencies = [
  "unused_port",
 ]
 
+[[package]]
+name = "lighthouse_validator_store"
+version = "0.1.0"
+dependencies = [
+ "account_utils",
+ "beacon_node_fallback",
+ "doppelganger_service",
+ "either",
+ "environment",
+ "eth2",
+ "futures",
+ "initialized_validators",
+ "logging",
+ "parking_lot 0.12.3",
+ "serde",
+ "signing_method",
+ "slashing_protection",
+ "slot_clock",
+ "task_executor",
+ "tokio",
+ "tracing",
+ "types",
+ "validator_metrics",
+ "validator_store",
+]
+
 [[package]]
 name = "lighthouse_version"
 version = "0.1.0"
@@ -9667,6 +9693,7 @@ dependencies = [
  "graffiti_file",
  "hyper 1.6.0",
  "initialized_validators",
+ "lighthouse_validator_store",
  "metrics",
  "monitoring_api",
  "parking_lot 0.12.3",
@@ -9722,6 +9749,7 @@ dependencies = [
  "health_metrics",
  "initialized_validators",
  "itertools 0.10.5",
+ "lighthouse_validator_store",
  "lighthouse_version",
  "logging",
  "parking_lot 0.12.3",
@@ -9754,6 +9782,7 @@ name = "validator_http_metrics"
 version = "0.1.0"
 dependencies = [
  "health_metrics",
+ "lighthouse_validator_store",
  "lighthouse_version",
  "logging",
  "malloc_utils",
@@ -9765,7 +9794,6 @@ dependencies = [
  "types",
  "validator_metrics",
  "validator_services",
- "validator_store",
  "warp",
  "warp_utils",
 ]
@@ -9808,9 +9836,7 @@ version = "0.1.0"
 dependencies = [
  "beacon_node_fallback",
  "bls",
- "doppelganger_service",
  "either",
- "environment",
  "eth2",
  "futures",
  "graffiti_file",
@@ -9818,6 +9844,7 @@ dependencies = [
  "parking_lot 0.12.3",
  "safe_arith",
  "slot_clock",
+ "task_executor",
  "tokio",
  "tracing",
  "tree_hash",
@@ -9830,19 +9857,8 @@ dependencies = [
 name = "validator_store"
 version = "0.1.0"
 dependencies = [
- "account_utils",
- "doppelganger_service",
- "initialized_validators",
- "logging",
- "parking_lot 0.12.3",
- "serde",
- "signing_method",
  "slashing_protection",
- "slot_clock",
- "task_executor",
- "tracing",
  "types",
- "validator_metrics",
 ]
 
 [[package]]
@@ -10100,6 +10116,7 @@ dependencies = [
  "eth2_network_config",
  "futures",
  "initialized_validators",
+ "lighthouse_validator_store",
  "logging",
  "parking_lot 0.12.3",
  "reqwest",