Feature/grafana example (#331)

* grafana-integration: initial version copied from /benchmark

* grafana-integration: add plugins/datasource

* grafana-integration: add pyroscope example dashboards

* grafana-integration: cleanup prometheus.yml

* grafana-integration: add basic explanation to readme

* makes grafana dashboard a little bit prettier

Co-authored-by: Dmitry Filimonov <dmitry@pyroscope.io>

examples/grafana-integration/README.md

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+# Pyroscope Grafana Integration
+This example shows pyroscope + grafana + prometheus integration
+
+# Running
+
+```bash
+docker-compose up
+```
+
+Then access grafana at http://localhost:3000
+Pyroscope is also available at http://localhost:4040
+
+
+# Development
+
+To start from scratch, use
+```
+yes | docker-compose rm
+docker-compose rm
+```

examples/grafana-integration/docker-compose.yml

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+version: "3.9"
+services:
+  prometheus:
+    image: prom/prometheus:latest
+    volumes:
+      - ./prometheus:/etc/prometheus/
+      - data-prometheus:/prometheus
+
+  grafana:
+    image: grafana/grafana:8.1.1
+    volumes:
+      - ./grafana-provisioning:/etc/grafana/provisioning
+      - ./grafana/grafana.ini:/etc/grafana/grafana.ini
+      - ./grafana/home.json:/default-dashboard.json
+    environment:
+    - "GF_INSTALL_PLUGINS=pyroscope-datasource,pyroscope-panel"
+    ports:
+      - 3000:3000
+
+  pyroscope:
+    image: "pyroscope/pyroscope:latest"
+    ports:
+      - 4040:4040
+    command:
+      - server
+    environment:
+      - PYROSCOPE_LOG_LEVEL=info
+      - PYROSCOPE_WAIT_AFTER_STOP=true
+
+
+  go-agent:
+    build:
+      context: ../golang
+
+volumes:
+  data-prometheus:
+    driver: local

examples/grafana-integration/grafana-provisioning/dashboards/main.yml

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+apiVersion: 1
+
+providers:
+- name: dashboards
+  type: file
+  updateIntervalSeconds: 5
+  options:
+    path: /etc/grafana/provisioning/dashboards