HTTP endpoints cleanup (#13251)

* remove validation package

* structs cleanup

* merge with apimiddleware removal

* more validation and Bls capitalization

* builder test fix

* use strconv for uint->str conversions

* use DecodeHexWithLength

* use exact param names

* rename http package to httputil

* change conversions to fmt.Sprintf

* handle query paramsd and route variables

* spans and receiver name

* split structs, move bytes helper

* missing ok check

* fix reference to indexed failure

* errors fixup

* add godoc to helper

* fix BLS casing and chainhead ref

* review

* fix import in tests

* gzl

cmd/prysmctl/validator/BUILD.bazel

@@ -46,6 +46,7 @@ go_test(
     data = glob(["testdata/**"]),
     embed = [":go_default_library"],
     deps = [
+        "//api/server:go_default_library",
         "//beacon-chain/rpc/eth/beacon:go_default_library",
         "//beacon-chain/rpc/eth/config:go_default_library",
         "//beacon-chain/rpc/eth/shared:go_default_library",

cmd/prysmctl/validator/withdraw_test.go

@@ -12,6 +12,7 @@ import (
 	"testing"
 
 	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/prysmaticlabs/prysm/v4/api/server"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/rpc/eth/beacon"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/rpc/eth/config"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/rpc/eth/shared"
@@ -220,8 +221,8 @@ func TestCallWithdrawalEndpoint_Errors(t *testing.T) {
 		if r.Method == http.MethodPost && r.RequestURI == "/eth/v1/beacon/pool/bls_to_execution_changes" {
 			w.WriteHeader(400)
 			w.Header().Set("Content-Type", "application/json")
-			err = json.NewEncoder(w).Encode(&shared.IndexedVerificationFailureError{
-				Failures: []*shared.IndexedVerificationFailure{
+			err = json.NewEncoder(w).Encode(&server.IndexedVerificationFailureError{
+				Failures: []*server.IndexedVerificationFailure{
 					{Index: 0, Message: "Could not validate SignedBLSToExecutionChange"},
 				},
 			})