Introduce TSDB service (#31520)

* Introduce TSDB service

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

Co-authored-by: Erik Sundell <erik.sundell87@gmail.com>
Co-authored-by: Will Browne <will.browne@grafana.com>
Co-authored-by: Torkel Ödegaard <torkel@grafana.org>
Co-authored-by: Will Browne <wbrowne@users.noreply.github.com>
Co-authored-by: Zoltán Bedi <zoltan.bedi@gmail.com>

pkg/plugins/manager/testdata/test-app/dashboards/connections.json

@@ -0,0 +1,29 @@
+{
+  "__inputs": [
+    {
+      "name": "DS_NAME",
+      "type": "datasource",
+      "pluginId": "graphite"
+    }
+  ],
+
+  "uid": "1MHHlVjzz",
+  "title": "Nginx Connections",
+  "revision": 25,
+  "schemaVersion": 11,
+  "tags": ["tag1", "tag2"],
+  "number_array": [1,2,3,10.33],
+  "boolean_true": true,
+  "boolean_false": false,
+
+  "rows": [
+    {
+      "panels": [
+        {
+          "type": "graph",
+          "datasource": "${DS_NAME}"
+        }
+      ]
+    }
+  ]
+}

pkg/plugins/manager/testdata/test-app/dashboards/connections_result.json

@@ -0,0 +1,21 @@
+{
+  "revision": 25,
+  "tags": ["tag1", "tag2"],
+  "boolean_false": false,
+  "boolean_true": true,
+  "number_array": [1,2,3,10.33],
+  "rows": [
+    {
+      "panels": [
+        {
+          "datasource": "graphite",
+          "type": "graph"
+        }
+      ]
+    }
+  ],
+  "schemaVersion": 11,
+  "title": "Nginx Connections",
+  "uid": "1MHHlVjzz",
+  "version": 0
+}

pkg/plugins/manager/testdata/test-app/dashboards/memory.json

@@ -0,0 +1,5 @@
+{
+  "title": "Nginx Memory",
+  "revision": 2,
+  "schemaVersion": 11
+}