HTTP Beacon API: /eth/v1/validator/contribution_and_proofs (#12660)

* HTTP Beacon API: `/eth/v1/validator/contribution_and_proofs`

* add comment to invalid test case

* fix validation and test

* review

---------

Co-authored-by: james-prysm <90280386+james-prysm@users.noreply.github.com>

network/BUILD.bazel

@@ -6,8 +6,6 @@ go_library(
         "auth.go",
         "endpoint.go",
         "external_ip.go",
-        "reader.go",
-        "writer.go",
     ],
     importpath = "github.com/prysmaticlabs/prysm/v4/network",
     visibility = ["//visibility:public"],
@@ -26,7 +24,6 @@ go_test(
         "auth_test.go",
         "endpoint_test.go",
         "external_ip_test.go",
-        "reader_test.go",
     ],
     embed = [":go_default_library"],
     deps = [

network/http/BUILD.bazel

@@ -0,0 +1,23 @@
+load("@prysm//tools/go:def.bzl", "go_library", "go_test")
+
+go_library(
+    name = "go_default_library",
+    srcs = [
+        "errors.go",
+        "reader.go",
+        "writer.go",
+    ],
+    importpath = "github.com/prysmaticlabs/prysm/v4/network/http",
+    visibility = ["//visibility:public"],
+    deps = ["@com_github_sirupsen_logrus//:go_default_library"],
+)
+
+go_test(
+    name = "go_default_test",
+    srcs = ["reader_test.go"],
+    embed = [":go_default_library"],
+    deps = [
+        "//testing/assert:go_default_library",
+        "//testing/require:go_default_library",
+    ],
+)

network/http/errors.go

@@ -0,0 +1,13 @@
+package http
+
+import (
+	"net/http"
+)
+
+func HandleError(w http.ResponseWriter, message string, code int) {
+	errJson := &DefaultErrorJson{
+		Message: message,
+		Code:    code,
+	}
+	WriteError(w, errJson)
+}

network/http/reader.go

@@ -1,4 +1,4 @@
-package network
+package http
 
 import (
 	"net/http"

network/http/reader_test.go

@@ -1,4 +1,4 @@
-package network
+package http
 
 import (
 	"fmt"

network/http/writer.go

@@ -1,4 +1,4 @@
-package network
+package http
 
 import (
 	"bytes"