Refactor sonatype deployment script to use maven for packaging and deployment.

This cl introduces/configures differents maven plugins to achieve its goal:
- maven-jar-plugin: to build the jar file from classes present on the file system instead of using file classes coming from the maven compile step.
- build-helper-maven-plugin: to attach source and javadoc jars as maven artifacts.
- maven-gpg-plugin: to sign all the maven artifacts before deployment
- nexus-staging-maven-plugin: to deploy the artifacts to sonatype. Note that plugin is still configured to deploy to the legacy OSSRH sonatype repo. Change needed to deploy to central,sonatype will be provided in a follow-up cl.

The plugin configuration will be shared between projects.

This cl also:
- simplify bazel build by automatically constructing file paths and bazel targets,
- add `sonatype-auto-release` option to automatically release the artifacts after deployment allowing using the script in a CI context.

PiperOrigin-RevId: 780912766

Author: jDramaix

maven/build_section.xml

@@ -0,0 +1,79 @@
+  <properties>
+    <classesDirectory>${project.artifactId}-classes</classesDirectory>
+    <javadocFile>${project.artifactId}-javadoc.jar</javadocFile>
+    <sourcesFile>${project.artifactId}-sources.jar</sourcesFile>
+    <nexusUrl>https://oss.sonatype.org/</nexusUrl>
+  </properties>
+
+  <build>
+    <plugins>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-jar-plugin</artifactId>
+          <version>3.4.2</version>
+          <configuration>
+            <classesDirectory>${classesDirectory}</classesDirectory>
+          </configuration>
+          <dependencies>
+              <dependency>
+                <groupId>org.codehaus.plexus</groupId>
+                <artifactId>plexus-io</artifactId>
+                <!-- We need at least 3.5.1 to avoid https://github.com/codehaus-plexus/plexus-io/issues/109. Once we upgrade maven-jar-plugin itself to a version new enough to depend on 3.5.1 or higher, we can remove this override. -->
+                <version>3.5.1</version>
+              </dependency>
+            </dependencies>
+        </plugin>
+      <plugin>
+        <groupId>org.codehaus.mojo</groupId>
+        <artifactId>build-helper-maven-plugin</artifactId>
+        <version>1.9.1</version>
+        <executions>
+          <execution>
+            <id>attach-artifacts</id>
+            <phase>package</phase>
+            <goals>
+              <goal>attach-artifact</goal>
+            </goals>
+            <configuration>
+              <artifacts>
+                <artifact>
+                  <file>${javadocFile}</file>
+                  <type>jar</type>
+                  <classifier>javadoc</classifier>
+                </artifact>
+                <artifact>
+                  <file>${sourcesFile}</file>
+                  <type>jar</type>
+                  <classifier>sources</classifier>
+                </artifact>
+              </artifacts>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-gpg-plugin</artifactId>
+          <version>3.2.7</version>
+          <executions>
+            <execution>
+              <id>sign-artifacts</id>
+              <phase>verify</phase>
+              <goals>
+                <goal>sign</goal>
+              </goals>
+            </execution>
+          </executions>
+        </plugin>
+        <plugin>
+          <groupId>org.sonatype.plugins</groupId>
+          <artifactId>nexus-staging-maven-plugin</artifactId>
+          <version>1.7.0</version>
+          <extensions>true</extensions>
+          <configuration>
+            <serverId>ossrh</serverId>
+            <nexusUrl>${nexusUrl}</nexusUrl>
+          </configuration>
+        </plugin>
+    </plugins>
+  </build>