fix: export postprocessors in core (#1419)

.changeset/purple-mangos-smoke.md

+---
+"llamaindex": patch
+---
+
+fix: export postprocessors in core

packages/llamaindex/src/index.edge.ts

@@ -51,6 +51,7 @@ export type {
 export * from "@llamaindex/core/indices";
 export * from "@llamaindex/core/llms";
 export * from "@llamaindex/core/memory";
+export * from "@llamaindex/core/postprocessor";
 export * from "@llamaindex/core/prompts";
 export * from "@llamaindex/core/query-engine";
 export * from "@llamaindex/core/response-synthesizers";