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.eyaml

@@ -0,0 +1,2 @@
+---
+mysql::db::grafana::pass: ENC[PKCS7,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]

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