Alerting: Add recording rules to ruler API and validation (#87779)

* Read path, main API

* Define record field for incoming requests

* Refactor several alerting specific validators into two paths

* Refactor validateCondition actually contain all the condition validation logic

* Move condition validation inside rule path

* Validators for recording rules

* Wire feature flag through to validators

* Test for accepting a valid recording rule

* Tests for negative case, no UID

* Test for ignoring alerting fields

* Build conditions based on recording rules as well

* Regenerate swagger docs

* Fix CRUD test to cover the right thing

* Re-generate swagger docs with backdated v0.30.2 version

* Regenerate base spec

* Regenerate ngalert specs

* Regenerate top level specs

* Comment and rename

* Return struct instead of modifying ref

pkg/services/ngalert/api/api_ruler.go

@@ -530,6 +530,7 @@ func toGettableExtendedRuleNode(r ngmodels.AlertRule, provenanceRecords map[stri
 			Provenance:           apimodels.Provenance(provenance),
 			IsPaused:             r.IsPaused,
 			NotificationSettings: AlertRuleNotificationSettingsFromNotificationSettings(r.NotificationSettings),
+			Record:               ApiRecordFromModelRecord(r.Record),
 		},
 	}
 	forDuration := model.Duration(r.For)