Add Debug RPC Service to Prysm (#5666)

* adding in proto debug service

* builds

* debug proto

* gaz ignore

Co-authored-by: prylabs-bulldozer[bot] <58059840+prylabs-bulldozer[bot]@users.noreply.github.com>

proto/beacon/rpc/v1/BUILD.bazel

@@ -0,0 +1,50 @@
+load("@rules_proto//proto:defs.bzl", "proto_library")
+
+# gazelle:ignore
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+load("@io_bazel_rules_go//proto:def.bzl", "go_proto_library")
+
+go_proto_library(
+    name = "go_grpc_gateway_library",
+    compilers = [
+        "@io_bazel_rules_go//proto:go_grpc",
+        "@grpc_ecosystem_grpc_gateway//protoc-gen-grpc-gateway:go_gen_grpc_gateway",
+    ],
+    importpath = "github.com/prysmaticlabs/prysm/proto/beacon/rpc/v1_gateway",
+    proto = ":v1_proto",
+    visibility = ["//visibility:public"],
+    deps = [
+        "//proto/beacon/p2p/v1:go_default_library",
+        "@go_googleapis//google/api:annotations_go_proto",
+        "@com_github_golang_protobuf//descriptor:go_default_library",
+    ],
+)
+
+go_proto_library(
+    name = "v1_go_proto",
+    compilers = ["@io_bazel_rules_go//proto:go_grpc"],
+    importpath = "github.com/prysmaticlabs/prysm/proto/beacon/rpc/v1",
+    proto = ":v1_proto",
+    visibility = ["//visibility:public"],
+    deps = [
+        "//proto/beacon/p2p/v1:go_default_library",
+        "@go_googleapis//google/api:annotations_go_proto",
+    ],
+)
+
+go_library(
+    name = "go_default_library",
+    embed = [":v1_go_proto"],
+    importpath = "github.com/prysmaticlabs/prysm/proto/beacon/rpc/v1",
+    visibility = ["//visibility:public"],
+)
+
+proto_library(
+    name = "v1_proto",
+    srcs = ["debug.proto"],
+    visibility = ["//visibility:public"],
+    deps = [
+        "//proto/beacon/p2p/v1:v1_proto",
+        "@go_googleapis//google/api:annotations_proto",
+    ],
+)

proto/beacon/rpc/v1/debug.proto

@@ -0,0 +1,33 @@
+syntax = "proto3";
+
+package ethereum.beacon.rpc.v1;
+
+import "proto/beacon/p2p/v1/types.proto";
+import "google/api/annotations.proto";
+
+// Debug service API
+//
+// The debug service in Prysm provides API access to various utilities
+// for debugging the beacon node's functionality at runtime, such as being able
+// to retrieve the beacon state by block root or state root from the node directly.
+service Debug {
+    // Returns a beacon state by filter criteria from the beacon node.
+    rpc GetBeaconState(BeaconStateRequest) returns (ethereum.beacon.p2p.v1.BeaconState) {
+        option (google.api.http) = {
+            get: "/eth/v1alpha1/beacon/state"
+        };
+    }
+}
+
+message BeaconStateRequest {
+    oneof query_filter {
+        // The slot corresponding to a desired beacon state.
+        uint64 slot = 1;
+
+        // The block root corresponding to a desired beacon state.
+        bytes block_root = 2;
+
+        // The state root corresponding to a desired beacon state.
+        bytes state_root = 3;
+    }
+}