[improve] Make sslTruststorePassword sensitive for the Kafka connec…

…tor config (apache#21639)

### Motivation

sslTruststorePassword value contains the sensitive passwords. We need to mark it as a sensitive configuration field.

### Modifications

- Make `sslTruststorePassword` sensitive for the Kafka connector config

pulsar-io/kafka/src/main/java/org/apache/pulsar/io/kafka/KafkaSinkConfig.java

@@ -74,6 +74,7 @@ public class KafkaSinkConfig implements Serializable {
 
     @FieldDoc(
             defaultValue = "",
+            sensitive = true,
             help = "The password for the trust store file.")
     private String sslTruststorePassword;
 
@@ -126,4 +127,4 @@ public static KafkaSinkConfig load(Map<String, Object> map) throws IOException {
         ObjectMapper mapper = new ObjectMapper();
         return mapper.readValue(mapper.writeValueAsString(map), KafkaSinkConfig.class);
     }
-}
+}

pulsar-io/kafka/src/main/java/org/apache/pulsar/io/kafka/KafkaSourceConfig.java

@@ -75,6 +75,7 @@ public class KafkaSourceConfig implements Serializable {
 
     @FieldDoc(
             defaultValue = "",
+            sensitive = true,
             help = "The password for the trust store file.")
     private String sslTruststorePassword;
 
@@ -156,4 +157,4 @@ public static KafkaSourceConfig load(Map<String, Object> map) throws IOException
         mapper.enable(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT);
         return mapper.readValue(mapper.writeValueAsString(map), KafkaSourceConfig.class);
     }
-}
+}