feat(api): adding api server code

templater can be used as a commmand line tool or as an api server.

data/config/test.json

@@ -0,0 +1,26 @@
+{
+  "Name": "loki",
+  "ConfigFiles": [
+    {
+      "destination": "/etc/loki/loki-local-config.yaml",
+      "source": "loki-local-config.pktpl.hcl",
+      "mod": "600"
+    }
+  ],
+  "AuthEnabled": false,
+  "User": "loki",
+  "Group": "grafana",
+  "HTTPPort": "3100",
+  "GRPCPort": "9096",
+  "AlertManagerURL": "http://localhost:9093",
+  "StorageRoot": "/var/loki",
+  "SharedStore": "filesystem",
+  "ObjectStore": "filesystem",
+  "LogLevel": "error",
+  "S3": {
+      "URL": "",
+      "BucketName": "",
+      "APIKey": "",
+      "APISecretKey": ""
+  }
+}