[improve] [ws] add cryptoKeyReaderFactoryClassName into the file webs…

…ocket.conf (#20840)

Motivation: Since the PR #16234 add the prop `cryptoKeyReaderFactoryClassName` for the WebSocket Proxy, but did not add this prop to `websocket.conf`.  This can make the script which try to replacement attribute a bit difficult to write

Modifications: add the conf `cryptoKeyReaderFactoryClassName` into the file `websocket.conf`

conf/websocket.conf

@@ -194,3 +194,6 @@ zooKeeperSessionTimeoutMillis=-1
 # ZooKeeper cache expiry time in seconds
 # Deprecated: use metadataStoreCacheExpirySeconds
 zooKeeperCacheExpirySeconds=-1
+
+# CryptoKeyReader factory classname to support encryption at websocket.
+cryptoKeyReaderFactoryClassName=

pulsar-websocket/src/test/java/org/apache/pulsar/websocket/WebSocketProxyConfigurationTest.java

@@ -34,6 +34,7 @@
 import java.io.PrintWriter;
 
 import static org.testng.Assert.assertEquals;
+import static org.testng.Assert.assertNull;
 
 public class WebSocketProxyConfigurationTest {
 
@@ -64,13 +65,15 @@ public void testBackwardCompatibility() throws IOException {
             printWriter.println("metadataStoreCacheExpirySeconds=500");
             printWriter.println("zooKeeperSessionTimeoutMillis=-1");
             printWriter.println("zooKeeperCacheExpirySeconds=-1");
+            printWriter.println("cryptoKeyReaderFactoryClassName=");
         }
         testConfigFile.deleteOnExit();
         stream = new FileInputStream(testConfigFile);
         serviceConfig = PulsarConfigurationLoader.create(stream, WebSocketProxyConfiguration.class);
         stream.close();
         assertEquals(serviceConfig.getMetadataStoreSessionTimeoutMillis(), 60);
         assertEquals(serviceConfig.getMetadataStoreCacheExpirySeconds(), 500);
+        assertNull(serviceConfig.getCryptoKeyReaderFactoryClassName());
 
         testConfigFile = new File("tmp." + System.currentTimeMillis() + ".properties");
         if (testConfigFile.exists()) {
@@ -81,13 +84,15 @@ public void testBackwardCompatibility() throws IOException {
             printWriter.println("metadataStoreCacheExpirySeconds=30");
             printWriter.println("zooKeeperSessionTimeoutMillis=100");
             printWriter.println("zooKeeperCacheExpirySeconds=300");
+            printWriter.println("cryptoKeyReaderFactoryClassName=A.class");
         }
         testConfigFile.deleteOnExit();
         stream = new FileInputStream(testConfigFile);
         serviceConfig = PulsarConfigurationLoader.create(stream, WebSocketProxyConfiguration.class);
         stream.close();
         assertEquals(serviceConfig.getMetadataStoreSessionTimeoutMillis(), 100);
         assertEquals(serviceConfig.getMetadataStoreCacheExpirySeconds(), 300);
+        assertEquals(serviceConfig.getCryptoKeyReaderFactoryClassName(), "A.class");
     }
 
     @Test