Add graphite listener

docs/guide/reporting/real-time/graphite.md

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+#### Graphite
+
+In a similar fashion to InfluxDB, you can use Graphite and Grafana. Here is an example test plan using the `graphiteListener`:
+
+```java
+import static org.assertj.core.api.Assertions.assertThat;
+import static us.abstracta.jmeter.javadsl.JmeterDsl.*;
+
+import java.io.IOException;
+import java.time.Duration;
+import org.junit.jupiter.api.Test;
+import us.abstracta.jmeter.javadsl.core.TestPlanStats;
+
+public class PerformanceTest {
+
+  @Test
+  public void testPerformance() throws IOException {
+    TestPlanStats stats = testPlan(
+        threadGroup(2, 10,
+            httpSampler("http://my.service")
+        ),
+        graphiteListener("localhost:2004")
+    ).run();
+    assertThat(stats.overall().sampleTimePercentile99()).isLessThan(Duration.ofSeconds(5));
+  }
+
+}
+```
+
+As in the InfluxDB scenario, you can try it locally by running `docker-compose up` (previously [installing Docker](https://docs.docker.com/get-docker/) in your machine) inside [this directory](/docs/guide/reporting/real-time/graphite). After containers are started, you can follow the same steps as in the InfluxDB scenario.
+
+::: warning
+Use the provided `docker-compose` settings for local tests only. It uses weak credentials and is not properly configured for production purposes.
+:::
+
+::: warning
+`graphiteListener` is configured to use Pickle Protocol, and port 2004, by default. This is more efficient than text plain protocol, which is the one used by default by JMeter.
+:::

docs/guide/reporting/real-time/graphite/docker-compose.yml

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+version: '3'
+services:
+  graphite:
+    image: graphiteapp/graphite-statsd:1.1.10-5
+    ports:
+      - '2003:2003'
+      - '2004:2004'
+      - '8080:80'
+    volumes:
+      - ./graphite-conf/carbon.conf:/opt/graphite/conf/carbon.conf
+      - ./graphite-conf/storage-schemas.conf:/opt/graphite/conf/storage-schemas.conf
+      - graphite-data:/opt/graphite/storage/whisper
+  grafana:
+    image: grafana/grafana:8.1.1
+    ports:
+      - '3000:3000'
+    volumes:
+      - grafana-data:/var/lib/grafana
+      - ./grafana-provisioning/:/etc/grafana/provisioning
+    depends_on:
+      - graphite
+    environment:
+      - GF_SECURITY_ADMIN_USER=admin
+      - GF_SECURITY_ADMIN_PASSWORD=1234
+      - GF_DASHBOARDS_DEFAULT_HOME_DASHBOARD_PATH=/etc/grafana/provisioning/dashboards/jmeter.json
+volumes:
+  graphite-data:
+  grafana-data:

docs/guide/reporting/real-time/graphite/grafana-provisioning/dashboards/dashboard.yml

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+apiVersion: 1
+providers:
+  - name: JMeter Dashboards
+    allowUiUpdates: true
+    options:
+      path: /etc/grafana/provisioning/dashboards