feat(cloud): unlimited seats (#166)

* feat: add unlimitedSeats to subscription

* feat: set unlimited seats to true for pro plans

* feat: add unlimited invites messaging

* feat: upgrade to pro via auth client

* feat: add subscription repo funcs

* chore: move subscription utils to shared

* feat: skip updating subscription if unlimited seats

packages/shared/src/utils/index.ts

@@ -1,2 +1,3 @@
 export * from "./generateUID";
 export * from "./generateSlug";
+export * from "./subscriptions";