fix: add WithLock to limit concurrency

Signed-off-by: Dr. Carsten Leue <carsten.leue@de.ibm.com>

ioeither/sync.go

@@ -0,0 +1,28 @@
+// Copyright (c) 2023 IBM Corp.
+// All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ioeither
+
+import (
+	"context"
+
+	G "github.com/IBM/fp-go/ioeither/generic"
+	L "github.com/IBM/fp-go/lazy"
+)
+
+// WithLock executes the provided IO operation in the scope of a lock
+func WithLock[E, A any](lock L.Lazy[context.CancelFunc]) func(fa IOEither[E, A]) IOEither[E, A] {
+	return G.WithLock[IOEither[E, A]](lock)
+}