Spark transformer that builds a unified %Ash.Info.Manifest{} from all domains' RPC configurations and persists it on the DSL state.

Collects RPC configs from ALL domains via TypeDiscovery and RpcConfigCollector, generates a single spec via Ash.Info.Manifest.Generator.generate/1, and persists the result. Lookups (:resource_lookup, :action_lookup, :type_lookup) are derived afterward by AshTypescript.Manifest.Transformers.DecorateManifest, which runs next and also annotates the manifest with ash_typescript-specific data under custom.ash_typescript.