Add RAT plugin to check copyright headers

pom.xml

@@ -74,6 +74,27 @@
 				</plugin>
 			</plugins>
 		</pluginManagement>
+		<plugins>
+			<plugin>
+				<groupId>org.apache.rat</groupId>
+				<artifactId>apache-rat-plugin</artifactId>
+				<version>${rat.version}</version>
+				<configuration>
+					<includes>
+						<include>**/*.java</include>
+					</includes>
+				</configuration>
+				<executions>
+					<execution>
+						<id>rat-check</id>
+						<phase>verify</phase>
+						<goals>
+							<goal>check</goal>
+						</goals>
+					</execution>
+				</executions>
+			</plugin>
+		</plugins>
 	</build>
 
 	<properties>
@@ -89,6 +110,7 @@
 		<format.skip>false</format.skip>
 		<formatter.version>2.23.0</formatter.version>
 		<impsort.version>1.9.0</impsort.version>
+		<rat.version>0.16</rat.version>
 
 		<sonatypeOssDistMgmtNexusUrl>https://jakarta.oss.sonatype.org/</sonatypeOssDistMgmtNexusUrl>
 		<sonatypeOssDistMgmtStagingUrl>${sonatypeOssDistMgmtNexusUrl}content/repositories/staging/</sonatypeOssDistMgmtStagingUrl>