Implement access controlled edit schedule endpoint

Add PATCH /api/schedule endpoint for editing the schedule in a manner
that's access controlled.

shared/types/schedule.d.ts

@@ -49,3 +49,15 @@ export interface Schedule {
 	roles?: Role[],
 	rota?: Shift[],
 }
+
+export type ChangeRecord<T extends { id: string }> =
+	| { op: "set", data: T }
+	| { op: "del", data: { id: string }}
+;
+
+export interface SchedulePatch {
+	locations?: ChangeRecord<ScheduleLocation>[],
+	events?: ChangeRecord<ScheduleEvent>[],
+	roles?: ChangeRecord<Role>[],
+	rota?: ChangeRecord<Shift>[],
+}