Add initialize(..) operator to promote initialization safety.

The initialize operator replaces the common initialization safety pattern using an if-then-else or Java's ternary operator to ensure that a collaborator reference has bee properly initialized:

target = target != null ? target : new Target();

spring-geode/src/test/java/org/springframework/geode/core/util/ObjectUtilsUnitTests.java

@@ -95,7 +95,7 @@ public class ObjectUtilsUnitTests {
 	}
 
 	@Test(expected = IllegalArgumentException.class)
-	public void asPdxInstanceTypeReturnNonMatchingType() {
+	public void asPdxInstanceTypeReturningNonMatchingType() {
 
 		C source = new C();
 
@@ -300,6 +300,16 @@ public class ObjectUtilsUnitTests {
 		}
 	}
 
+	@Test
+	public void initializeWithNonNullTarget() {
+		assertThat(ObjectUtils.initialize("test", () -> "mock")).isEqualTo("test");
+	}
+
+	@Test
+	public void initializeWithNullTarget() {
+		assertThat(ObjectUtils.initialize(null, () -> "mock")).isEqualTo("mock");
+	}
+
 	@Test
 	public void invokeMethodOnObjectReturnsValue() {
 		assertThat(ObjectUtils.<String>invoke(new TestObject(), "testMethod")).isEqualTo("TEST");