[fix][client] Make protobuf-java dependency optional in java client libraries (apache#23632)

(cherry picked from commit b284cd4)
(cherry picked from commit e1e4296)

Author: Shawyeok

distribution/shell/src/assemble/LICENSE.bin.txt

@@ -421,10 +421,6 @@ MIT License
  * The Checker Framework
     - checker-qual-3.33.0.jar
 
-Protocol Buffers License
- * Protocol Buffers
-   - protobuf-java-3.25.5.jar -- ../licenses/LICENSE-protobuf.txt
-
 CDDL-1.1 -- ../licenses/LICENSE-CDDL-1.1.txt
  * Java Annotations API
     - javax.annotation-api-1.3.2.jar

pulsar-client/pom.xml

@@ -30,7 +30,7 @@
   </parent>
 
   <artifactId>pulsar-client-original</artifactId>
-  <name>Pulsar Client Java</name>
+  <name>Pulsar Client Java Original</name>
 
   <dependencies>
     <dependency>

pulsar-common/pom.xml

@@ -201,11 +201,6 @@
       <optional>true</optional>
     </dependency>
 
-    <dependency>
-      <groupId>com.google.protobuf</groupId>
-	  <artifactId>protobuf-java</artifactId>
-    </dependency>
-
     <dependency>
       <groupId>com.spotify</groupId>
       <artifactId>completable-futures</artifactId>