refactor: Break apart monolithic configuration schema (#1977)

[skip ci]

src/config/schema/conditions/stock/users.ts

@@ -0,0 +1,7 @@
+import { z } from 'zod';
+
+// https://www.home-assistant.io/dashboards/conditional/#user
+export const usersConditionSchema = z.object({
+  condition: z.literal('user'),
+  users: z.string().array().min(1),
+});