feat: add vmagent role

- add vmagent role for vicmet

hieradata/roles/infra/metrics/vmagent.yaml

@@ -0,0 +1,4 @@
+---
+profiles::packages::include:
+  vmagent: {}
+  vmutils: {}

site/roles/manifests/infra/metrics/vmagent.pp

@@ -0,0 +1,10 @@
+# a role to deploy victoria metrics vmagent
+class roles::infra::metrics::vmagent {
+  if $facts['firstrun'] {
+    include profiles::defaults
+    include profiles::firstrun::init
+  }else{
+    include profiles::defaults
+    include profiles::base
+  }
+}