Change bookkeeper main method class (apache#8065)

### Motivation
* `BookieServer::main()` is legacy method.
https://github.com/apache/bookkeeper/blob/release-4.9.2/bookkeeper-server/src/main/java/org/apache/bookkeeper/proto/BookieServer.java#L310-L315
```
    /**
     * Legacy Method to run bookie server.
     */
    public static void main(String[] args) {
        Main.main(args);
    }

```

### Modifications

* Call `Main::main()` instead of `BookieServer::main()`.
https://github.com/apache/bookkeeper/blob/release-4.9.2/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/Main.java#L202-L205

bin/bookkeeper

@@ -183,7 +183,7 @@ OPTS="$OPTS -Dpulsar.log.file=$BOOKIE_LOG_FILE"
 #Change to BK_HOME to support relative paths
 cd "$BK_HOME"
 if [ $COMMAND == "bookie" ]; then
-    exec $JAVA $OPTS $JMX_ARGS org.apache.bookkeeper.proto.BookieServer --conf $BOOKIE_CONF $@
+    exec $JAVA $OPTS $JMX_ARGS org.apache.bookkeeper.server.Main --conf $BOOKIE_CONF $@
 elif [ $COMMAND == "autorecovery" ]; then
     exec $JAVA $OPTS $JMX_ARGS org.apache.bookkeeper.replication.AutoRecoveryMain --conf $BOOKIE_CONF $@
 elif [ $COMMAND == "localbookie" ]; then

bin/pulsar

@@ -308,7 +308,7 @@ elif [ $COMMAND == "bookie" ]; then
     PULSAR_LOG_FILE=${PULSAR_LOG_FILE:-"bookkeeper.log"}
     # Pass BOOKIE_EXTRA_OPTS option defined in pulsar_env.sh
     OPTS="$OPTS $BOOKIE_EXTRA_OPTS"
-    exec $JAVA $OPTS -Dpulsar.log.file=$PULSAR_LOG_FILE org.apache.bookkeeper.proto.BookieServer --conf $PULSAR_BOOKKEEPER_CONF $@
+    exec $JAVA $OPTS -Dpulsar.log.file=$PULSAR_LOG_FILE org.apache.bookkeeper.server.Main --conf $PULSAR_BOOKKEEPER_CONF $@
 elif [ $COMMAND == "zookeeper" ]; then
     PULSAR_LOG_FILE=${PULSAR_LOG_FILE:-"zookeeper.log"}
     exec $JAVA ${ZK_OPTS} $OPTS $ASPECTJ_AGENT -Dpulsar.log.file=$PULSAR_LOG_FILE org.apache.pulsar.zookeeper.ZooKeeperStarter $PULSAR_ZK_CONF $@