fix(aws-lambda): set cookies with comma is bugged (#3084)

* fix(aws-lambda): setting cookies with comma is bugged

* style: apply lint & format fixes

src/adapter/aws-lambda/handler.ts

@@ -258,7 +258,12 @@ abstract class EventProcessor<E extends LambdaEvent> {
 
   setCookies(event: E, res: Response, result: APIGatewayProxyResult) {
     if (res.headers.has('set-cookie')) {
-      const cookies = res.headers.get('set-cookie')?.split(', ')
+      const cookies = res.headers.getSetCookie
+        ? res.headers.getSetCookie()
+        : Array.from(res.headers.entries())
+            .filter(([k]) => k === 'set-cookie')
+            .map(([, v]) => v)
+
       if (Array.isArray(cookies)) {
         this.setCookiesToResult(event, result, cookies)
         res.headers.delete('set-cookie')