Function addCorsHeaders

addCorsHeaders(
    response: Response,
    config?: CorsConfig<unknown, unknown>,
    requestOrigin?: string | null,
): Response
Helper function to add CORS headers to any response

Preserves any existing CORS headers set by the handler - only adds default CORS headers if they are not already present.
Parameters
- response: Response
  The response to add CORS headers to
- Optionalconfig: CorsConfig<unknown, unknown>
  Optional CORS configuration to use instead of defaults
- OptionalrequestOrigin: string | null
  The origin from the incoming request
Returns Response
A new response with CORS headers added
Example
```
const response = new Response('Hello');
const corsResponse = addCorsHeaders(response);
```
- Defined in cors.ts:190