feat: grafana IRM escalation module

новый модуль modules/grafana_irm_escalation, dev/adibrov подключён.
секреты (oncall_access_token, user id) хранятся в Vault, в git не попадают

environments/modules/grafana_irm_escalation/main.tf

@@ -0,0 +1,21 @@
+resource "grafana_oncall_escalation_chain" "this" {
+  name    = var.name
+  team_id = var.team_id
+}
+
+resource "grafana_oncall_escalation" "steps" {
+  # ключ = строковый индекс; порядок шагов фиксирован через position
+  for_each = { for idx, step in var.steps : tostring(idx) => step }
+
+  escalation_chain_id              = grafana_oncall_escalation_chain.this.id
+  type                             = each.value.type
+  position                         = tonumber(each.key)
+  duration                         = each.value.duration_seconds
+  persons_to_notify                = each.value.persons_to_notify
+  persons_to_notify_next_each_time = each.value.persons_to_notify_next_each_time
+  notify_on_call_from_schedule     = each.value.notify_on_call_from_schedule
+  group_to_notify                  = each.value.group_to_notify
+  action_to_trigger                = each.value.action_to_trigger
+  notify_to_team_members           = each.value.notify_to_team_members
+  important                        = each.value.important
+}