Alerting: Add endpoint for querying state history (#62166)

* Define endpoint and generate

* Wire up and register endpoint

* Cleanup, define authorization

* Forgot the leading slash

* Wire up query and SignedInUser

* Wire up timerange query params

* Add todo for label queries

* Drop comment

* Update path to rules subtree

pkg/services/ngalert/api/tooling/spec.json

@@ -2632,6 +2632,23 @@
           }
         }
       }
+    },
+    "/api/v1/rules/history": {
+      "get": {
+        "produces": [
+          "application/json"
+        ],
+        "tags": [
+          "history"
+        ],
+        "summary": "Query state history.",
+        "operationId": "RouteGetStateHistory",
+        "responses": {
+          "200": {
+            "$ref": "#/responses/StateHistory"
+          }
+        }
+      }
     }
   },
   "definitions": {
@@ -6330,6 +6347,7 @@
       "$ref": "#/definitions/gettableAlert"
     },
     "gettableAlerts": {
+      "description": "GettableAlerts gettable alerts",
       "type": "array",
       "items": {
         "$ref": "#/definitions/gettableAlert"
@@ -6708,4 +6726,4 @@
       "type": "basic"
     }
   }
-}
+}