feat: add haproxy2 role (#322)

- add basic haproxy2 role
- add peers and resolvers
- add haproxy2+ metrics frontend

Reviewed-on: https://git.query.consul/unkinben/puppet-prod/pulls/322

site/roles/manifests/infra/halb/haproxy2.pp

@@ -0,0 +1,10 @@
+# a role to deploy an anycast haproxy2 node
+class roles::infra::halb::haproxy2 {
+  if $facts['firstrun'] {
+    include profiles::defaults
+    include profiles::firstrun::init
+  }else{
+    include profiles::defaults
+    include profiles::base
+  }
+}