chore: bundle vendor code (#9016)

This PR removes the manual vendoring process. Third party code can now
be updated using the typical NPM pipeline with types/code bundling done
through Rollup.

docs/api/puppeteer.eventtype.md

@@ -7,5 +7,5 @@ sidebar_label: EventType
 **Signature:**
 
 ```typescript
-export declare type EventType = string | symbol;
+declare type EventType = string | symbol;
 ```

docs/api/puppeteer.handler.md

@@ -7,5 +7,5 @@ sidebar_label: Handler
 **Signature:**
 
 ```typescript
-export declare type Handler<T = any> = (event?: T) => void;
+declare type Handler<T = any> = (event?: T) => void;
 ```