Add copyright header

Signed-off-by: Willy Lulciuc <willy.lulciuc@gmail.com>

Author: wslulciuc

api/src/main/java/marquez/api/exceptions/FacetNotValid.java

@@ -1,3 +1,8 @@
+/*
+ * Copyright 2018-2024 contributors to the Marquez project
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 package marquez.api.exceptions;
 
 import static com.google.common.base.Preconditions.checkNotNull;

api/src/main/java/marquez/api/models/Metadata.java

@@ -1,3 +1,8 @@
+/*
+ * Copyright 2018-2024 contributors to the Marquez project
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 package marquez.api.models;
 
 import static com.google.common.collect.ImmutableSet.toImmutableSet;

api/src/main/java/marquez/api/models/VersionId.java

@@ -1,3 +1,8 @@
+/*
+ * Copyright 2018-2024 contributors to the Marquez project
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 package marquez.api.models;
 
 import java.util.UUID;

api/src/test/java/marquez/api/models/MetadataTest.java

@@ -1,3 +1,8 @@
+/*
+ * Copyright 2018-2024 contributors to the Marquez project
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 package marquez.api.models;
 
 import static io.openlineage.server.OpenLineage.RunEvent.EventType.COMPLETE;