Add reusable storage pool module with lvmcluster san pool

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

incus/storage.tf

@@ -0,0 +1,10 @@
+module "storage" {
+  source            = "./modules/storage"
+  for_each          = var.incus_storage_pools
+  name              = each.key
+  driver            = each.value.driver
+  hypervisors       = toset(keys(var.incus_hypervisors))
+  witnesses         = toset(keys(var.incus_witnesses))
+  hypervisor_config = each.value.hypervisor_config
+  witness_config    = each.value.witness_config
+}