Migrate Response APIs to async

[inancgumus]

Tasks

Beta Give feedback

1. Async Response #1364
   async mapping refactor stability +4
   
2. Add missing browser response docs k6-docs#1613
   +0
3. Update Request and Response to return Promise k6-DefinitelyTyped#55
   +0
4. Release Notes

---

What

Migrate the following APIs according to the How section in #428:

Class	Method	Current k6 Return	PW return
Response	allHeaders	Record<string,string>	Promise<{[key:string]:string;}>
Response	body	ArrayBuffer	Promise
Response	headerValue	string|null	Promise<null|string>
Response	headerValues	string[]	Promise<Array>
Response	headersArray	Array<{name:string;value:string}>	Promise<Array<{name:string;value:string;}>>
Response	json	any	Promise
Response	securityDetails	SecurityDetailsObject|null	Promise<null|{issuer?:string;protocol?:string;subjectName?:string;validFrom?:number;validTo?:number;}>
Response	serverAddr	{ipAddress:string;port:number}|null	Promise<null|{ipAddress:string;port:number;}>
Response	size	{body:number;headers:number}	not found in Playwright

For details on the Why and How, check the overarching issue in #428.

[allansson]

The type defintions for this are already async.