Initial Grafana role, split out of ansible-role-eom

Moves the Grafana Helm deployment and LDAP template out of
ericomeehan.eom into its own role, and:

- maps cn=DevOps Members,ou=Teams to Editor in the DevOps org (org 2),
  after DevOps Owners so owners keep Admin
- pins chart 11.4.2 from Bitnami's OCI registry (the HTTP index no
  longer carries it) so redeploys don't upgrade to Grafana 12
- pins the bitnamilegacy/grafana image the cluster is already running

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

meta/main.yml

@@ -0,0 +1,13 @@
+#SPDX-License-Identifier: MIT-0
+galaxy_info:
+  author: Eric Meehan
+  description: Deploy Grafana on the eom.dev Kubernetes cluster with LDAP sign-in
+  company: eom.dev
+  license: MIT-0
+  min_ansible_version: "2.15"
+  galaxy_tags:
+    - grafana
+    - monitoring
+    - kubernetes
+
+dependencies: []