made micrometer optional

Author: chernser

examples/client-v2/src/main/java/com/clickhouse/examples/client_v2/Stream2DbWriter.java

@@ -34,7 +34,6 @@ public Stream2DbWriter(String endpoint, String user, String password, String dat
                 .setUsername(user)
                 .setPassword(password)
                 .compressServerResponse(true)
-                .registerClientMetrics("test not a registry", "test")
                 .setDefaultDatabase(database);
 
         this.client = clientBuilder.build();