feat: add database generation to grafana

- ensure a database, user and credential is created for each grafana node
- ensure all databases for a region are included in a mariadb cluster
- refine params with stdlib types

hieradata/country/au/region/syd1/infra/sql/galera.yaml

@@ -2,3 +2,14 @@
 profiles::sql::galera_member::cluster_name: au-syd1
 profiles::sql::galera_member::galera_master: ausyd1nxvm1027.main.unkin.net
 profiles::sql::galera_member::innodb_buffer_pool_size: 256M
+
+mysql::db:
+  grafana:
+    name: grafana
+    user: grafana
+    password: "%{alias('mysql::db::grafana::pass')}"
+    grant:
+      - SELECT
+      - INSERT
+      - UPDATE
+      - DELETE