Add getDatabaseName() method to ClickHouseContainer (#8339)

Author: colin-lee

modules/clickhouse/src/main/java/org/testcontainers/clickhouse/ClickHouseContainer.java

@@ -97,6 +97,11 @@ public String getPassword() {
         return password;
     }
 
+    @Override
+    public String getDatabaseName() {
+        return databaseName;
+    }
+
     @Override
     public String getTestQueryString() {
         return TEST_QUERY;