Migrate Page APIs to async

[inancgumus]

Tasks

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1. Prepare Page.evaluate for async migration #1343
   mapping refactor stability +3
   
2. Prepare Page for async migration part #2 #1345
   mapping refactor stability +3
   
3. Prepare Page for async migration part #3 #1352
   mapping refactor stability +3
   
4. Async Page #1355
   async breaking mapping +3
   
5. Improve GetAttribute null attribute detection #1370
   enhancement playwright +2
   
6. Improve TextContent null element detection #1371
   enhancement playwright +2
   
7. Update to Async Page k6-docs#1602
   Area: browser +1
   
8. Update methods on Page type to return Promises k6-DefinitelyTyped#48
   +0
   
9. Release Notes:

---

What

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

Class	Method	Current k6 Return	PW return
Page	$	ElementHandle|null	Promise<ElementHandle<SVGElement|HTMLElement>|null>
Page	$$	ElementHandle[]	Promise<ElementHandle<SVGElement|HTMLElement>[]>
Page	bringToFront	void	Promise
Page	check	void	Promise
Page	close	void	Promise
Page	content	string	Promise
Page	dblclick	void	Promise
Page	dispatchEvent	void	Promise
Page	emulateMedia	void	Promise
Page	emulateVisionDeficiency	void	not found in Playwright
Page	evaluate<R, Arg>	R	Promise
Page	evaluateHandle<R, Arg>	JSHandle	Promise<SmartHandle>
Page	fill	void	Promise
Page	focus	void	Promise
Page	getAttribute	null|string	Promise<null|string>
Page	hover	void	Promise
Page	innerHTML	string	Promise
Page	innerText	string	Promise
Page	inputValue	string	Promise
Page	isChecked	boolean	Promise
Page	isDisabled	boolean	Promise
Page	isEditable	boolean	Promise
Page	isEnabled	boolean	Promise
Page	isHidden	boolean	Promise
Page	isVisible	boolean	Promise
Page	on	void	this
Page	opener	Page|null	Promise<null|Page>
Page	press	void	Promise
Page	reload	null|Response	Promise<null|Response>
Page	screenshot	ArrayBuffer	Promise
Page	selectOption	string[]	Promise<Array>
Page	setContent	void	Promise
Page	setExtraHTTPHeaders	void	Promise
Page	setInputFiles	void	Promise
Page	setViewportSize	void	Promise
Page	tap	void	Promise
Page	textContent	string	Promise<null|string>
Page	throttleCPU	void	not found in Playwright
Page	throttleNetwork	void	not found in Playwright
Page	title	string	Promise
Page	type	void	Promise
Page	uncheck	void	Promise
Page	viewportSize	{width:number;height:number;}	null|{width:number;height:number;}
Page	waitForLoadState	void	Promise
Page	waitForSelector	ElementHandle	Promise<null|ElementHandle<SVGElement|HTMLElement>>
Page	waitForTimeout	void	Promise

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