add javadoc and source jar to maven-plugin (#7698)

Author: ZheSun88

scripts/generator/templates/template-vaadin-maven-plugin-pom.xml

@@ -129,6 +129,41 @@
                     </execution>
                 </executions>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-source-plugin</artifactId>
+                <version>3.3.1</version>
+                <executions>
+                    <execution>
+                        <id>attach-sources</id>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>jar-no-fork</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-javadoc-plugin</artifactId>
+                <version>3.11.2</version>
+                <executions>
+                    <execution>
+                        <id>attach-javadocs</id>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>jar</goal>
+                        </goals>
+                    </execution>
+                </executions>
+                <configuration>
+                    <includeDependencySources>false</includeDependencySources>Add commentMore actions
+                    <includeTransitiveDependencySources>false</includeTransitiveDependencySources>
+                    <quiet>true</quiet>
+                    <additionalparam>-Xdoclint:none</additionalparam>
+                </configuration>
+            </plugin>
         </plugins>
 
     </build>