[postgres] Fix postgres-cdc connector cannot recognize the optional option 'slot.name'

Author: dongdongking008

flink-connector-postgres-cdc/src/main/java/com/ververica/cdc/connectors/postgres/table/PostgreSQLTableFactory.java

@@ -156,6 +156,7 @@ public Set<ConfigOption<?>> optionalOptions() {
         Set<ConfigOption<?>> options = new HashSet<>();
         options.add(PORT);
         options.add(DECODING_PLUGIN_NAME);
+        options.add(SLOT_NAME);
         return options;
     }
 }

flink-connector-postgres-cdc/src/test/java/com/ververica/cdc/connectors/postgres/table/PostgreSQLTableFactoryTest.java

@@ -96,6 +96,7 @@ public void testOptionalProperties() {
         options.put("port", "5444");
         options.put("decoding.plugin.name", "wal2json");
         options.put("debezium.snapshot.mode", "never");
+        options.put("slot.name", "flink");
 
         DynamicTableSource actualSource = createTableSource(options);
         Properties dbzProperties = new Properties();