feat: setup metrics agents

- set puppet::puppetdb_api class to export puppetdb
- set infra::dns::server class to export bind
- set all to export node and systemd metrics

site/profiles/manifests/base.pp

@@ -29,6 +29,7 @@ class profiles::base (
   include profiles::base::hosts
   include profiles::accounts::sysadmin
   include profiles::ntp::client
+  include profiles::metrics::default
 
   # configure dns records for client
   profiles::dns::client {"${facts['networking']['fqdn']}-default":}