Introducing default impl for Context::forEach (#3101)

This commit polishes #3092 to add the default implementation
of `forEach`, which was missing yet overlooked by japicmp.

Relates to: #3094.

reactor-core/build.gradle

@@ -162,7 +162,9 @@ task japicmp(type: JapicmpTask) {
 	// TODO after a .0 release, bump the gradle.properties baseline
 	// TODO after a .0 release, remove the reactor-core exclusions below if any
 	classExcludes = [ ]
-	methodExcludes = [ ]
+	methodExcludes = [
+			'reactor.util.context.ContextView#forEach(java.util.function.BiConsumer)'
+	]
 }
 
 gradle.taskGraph.afterTask { task, state ->

reactor-core/src/main/java/reactor/util/context/ContextView.java

@@ -144,5 +144,7 @@ default boolean isEmpty() {
 	 * @param action The action to be performed for each entry
 	 * @throws NullPointerException if the specified action is null
 	 */
-	void forEach(BiConsumer<Object, Object> action);
+	default void forEach(BiConsumer<Object, Object> action) {
+		stream().forEach(entry -> action.accept(entry.getKey(), entry.getValue()));
+	}
 }