feat(ai): add shared contentText utility (#6840)

Co-authored-by: Armin Ronacher <armin.ronacher@active-4.com>

packages/ai/src/index.ts

@@ -41,6 +41,7 @@ export * from "./utils/event-stream.ts";
 export * from "./utils/json-parse.ts";
 export * from "./utils/overflow.ts";
 export * from "./utils/retry.ts";
+export { contentText } from "./utils/text.ts";
 export * from "./utils/typebox-helpers.ts";
 export { uuidv7 } from "./utils/uuid.ts";
 export * from "./utils/validation.ts";