Alerting: Update alerting cue definitions (#104053)

Co-authored-by: Yuri Tseretyan <yuriy.tseretyan@grafana.com>

apps/alerting/notifications/kinds/v0alpha1/receiver_spec.cue

@@ -0,0 +1,16 @@
+package v0alpha1
+
+ReceiverSpec: {
+	title: string
+	integrations: [...#Integration]
+}
+
+#Integration: {
+	uid?:                   string
+	type:                   string
+	disableResolveMessage?: bool
+	settings: {
+		[string]: _
+	}
+	secureFields?: [string]: bool
+}

apps/alerting/notifications/kinds/v0alpha1/routingtree_spec.cue

@@ -0,0 +1,33 @@
+package v0alpha1
+
+RouteTreeSpec: {
+	defaults: #RouteDefaults
+	routes: [...#Route]
+}
+
+#RouteDefaults: {
+	receiver: string
+	group_by?: [...string]
+	group_wait?:      string
+	group_interval?:  string
+	repeat_interval?: string
+}
+
+#Matcher: {
+	type:  "=" | "!=" | "=~" | "!~" @cuetsy(kind="enum",memberNames="Equal|NotEqual|EqualRegex|NotEqualRegex")
+	label: string
+	value: string
+}
+
+#Route: {
+	receiver?: string
+	matchers?: [...#Matcher]
+	continue: bool
+
+	group_by?: [...string]
+	mute_time_intervals?: [...string]
+	routes?: [...#Route]
+	group_wait?:      string
+	group_interval?:  string
+	repeat_interval?: string
+}

apps/alerting/notifications/kinds/v0alpha1/template_spec.cue

@@ -0,0 +1,6 @@
+package v0alpha1
+
+TemplateGroupSpec: {
+	title:   string
+	content: string
+}

apps/alerting/notifications/kinds/v0alpha1/timeInterval_spec.cue

@@ -0,0 +1,19 @@
+package v0alpha1
+
+TimeIntervalSpec: {
+	name: string
+	time_intervals: [...#Interval]
+}
+
+#TimeRange: {
+	start_time: string
+	end_time:   string
+}
+#Interval: {
+	times?: [...#TimeRange]
+	weekdays?: [...string]
+	days_of_month?: [...string]
+	months?: [...string]
+	years?: [...string]
+	location?: string
+}