Print message metadata when getting message by id (#11092)

```
Batch Message ID: 10:1:0
Properties:
"X-Pulsar-batch-size    26825"
"X-Pulsar-num-batch-message    26"
"publish-time    2021-06-25T16:00:40.919+08:00"
```

pulsar-broker/src/main/java/org/apache/pulsar/broker/admin/impl/PersistentTopicsBase.java

@@ -2458,6 +2458,8 @@ private Response generateResponseWithEntry(Entry entry) throws IOException {
         }
         if (metadata.hasNumMessagesInBatch()) {
             responseBuilder.header("X-Pulsar-num-batch-message", metadata.getNumMessagesInBatch());
+            responseBuilder.header("X-Pulsar-batch-size", metadataAndPayload.readableBytes()
+                    - metadata.getSerializedSize());
         }
         if (metadata.hasNullValue()) {
             responseBuilder.header("X-Pulsar-null-value", metadata.isNullValue());

pulsar-client-admin/src/main/java/org/apache/pulsar/client/admin/internal/TopicsImpl.java

@@ -92,6 +92,7 @@ public class TopicsImpl extends BaseResource implements Topics {
     private final WebTarget adminV2Topics;
     // CHECKSTYLE.OFF: MemberName
     private static final String BATCH_HEADER = "X-Pulsar-num-batch-message";
+    private static final String BATCH_SIZE_HEADER = "X-Pulsar-batch-size";
     private static final String MESSAGE_ID = "X-Pulsar-Message-ID";
     private static final String PUBLISH_TIME = "X-Pulsar-publish-time";
     // CHECKSTYLE.ON: MemberName
@@ -1482,11 +1483,11 @@ private List<Message<byte[]>> getMessagesFromHttpResponse(String topic, Response
                 messageMetadata.setNullValue(Boolean.parseBoolean(tmp.toString()));
             }
 
-            tmp = headers.getFirst(BATCH_HEADER);
-            if (response.getHeaderString(BATCH_HEADER) != null) {
-                properties.put(BATCH_HEADER, (String) tmp);
-                return getIndividualMsgsFromBatch(topic, msgId, data, properties, messageMetadata);
+            tmp = headers.getFirst(BATCH_SIZE_HEADER);
+            if (tmp != null) {
+                properties.put(BATCH_SIZE_HEADER, (String) tmp);
             }
+
             for (Entry<String, List<Object>> entry : headers.entrySet()) {
                 String header = entry.getKey();
                 if (header.contains("X-Pulsar-PROPERTY-")) {
@@ -1495,6 +1496,12 @@ private List<Message<byte[]>> getMessagesFromHttpResponse(String topic, Response
                 }
             }
 
+            tmp = headers.getFirst(BATCH_HEADER);
+            if (response.getHeaderString(BATCH_HEADER) != null) {
+                properties.put(BATCH_HEADER, (String) tmp);
+                return getIndividualMsgsFromBatch(topic, msgId, data, properties, messageMetadata);
+            }
+
             return Collections.singletonList(new MessageImpl<byte[]>(topic, msgId, properties,
                     Unpooled.wrappedBuffer(data), Schema.BYTES, messageMetadata));
         }

pulsar-client-tools/src/main/java/org/apache/pulsar/admin/cli/CmdTopics.java

@@ -910,6 +910,17 @@ void run() throws PulsarAdminException {
                 System.out.println("Cannot find any messages based on ledgerId:"
                         + ledgerId + " entryId:" + entryId);
             } else {
+                if (message.getMessageId() instanceof BatchMessageIdImpl) {
+                    BatchMessageIdImpl msgId = (BatchMessageIdImpl) message.getMessageId();
+                    System.out.println("Batch Message ID: " + msgId.getLedgerId() + ":" + msgId.getEntryId() + ":" + msgId.getBatchIndex());
+                } else {
+                    MessageIdImpl msgId = (MessageIdImpl) message.getMessageId();
+                    System.out.println("Message ID: " + msgId.getLedgerId() + ":" + msgId.getEntryId());
+                }
+                if (message.getProperties().size() > 0) {
+                    System.out.println("Properties:");
+                    print(message.getProperties());
+                }
                 ByteBuf date = Unpooled.wrappedBuffer(message.getData());
                 System.out.println(ByteBufUtil.prettyHexDump(date));
             }