Migrate ElementHandle APIs to async

[ankur22]

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1. Prepare ElementHandle for async migration #1335
   mapping refactor stability +3
   
2. Async ElementHandle #1337
   async breaking mapping +3
   
3. Improve GetAttribute null attribute detection #1370
   enhancement playwright +2
   
4. Improve TextContent null element detection #1371
   enhancement playwright +2
   
5. Update to Async ElementHandle k6-docs#1598
   Area: browser +1
   
6. Update methods on ElementHandle type to return Promises k6-DefinitelyTyped#49
   +0
   
7. Add release notes

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What

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

Class	Method	Current k6 Return	PW return
ElementHandle	$	ElementHandle|null	Promise<ElementHandle<SVGElement|HTMLElement>|null>
ElementHandle	$$	ElementHandle[]	Promise<ElementHandle<SVGElement|HTMLElement>[]>
ElementHandle	boundingBox	Rect	Promise<null|{x:number;y:number;width:number;height:number;}>
ElementHandle	check	void	Promise
ElementHandle	contentFrame	Frame	Promise<null|Frame>
ElementHandle	dblclick	void	Promise
ElementHandle	dispatchEvent	void	Promise
ElementHandle	fill	void	Promise
ElementHandle	focus	void	Promise
ElementHandle	getAttribute	string|null	Promise<null|string>
ElementHandle	hover	void	Promise
ElementHandle	innerHTML	string	Promise
ElementHandle	innerText	string	Promise
ElementHandle	inputValue	string	Promise
ElementHandle	isChecked	boolean	Promise
ElementHandle	isDisabled	boolean	Promise
ElementHandle	isEditable	boolean	Promise
ElementHandle	isEnabled	boolean	Promise
ElementHandle	isHidden	boolean	Promise
ElementHandle	isVisible	boolean	Promise
ElementHandle	ownerFrame	Frame	Promise<null|Frame>
ElementHandle	press	void	Promise
ElementHandle	screenshot	ArrayBuffer	Promise
ElementHandle	scrollIntoViewIfNeeded	void	Promise
ElementHandle	selectOption	string[]	Promise<Array>
ElementHandle	selectText	void	Promise
ElementHandle	setInputFiles	void	Promise
ElementHandle	textContent	string	Promise<null|string>
ElementHandle	type	void	Promise
ElementHandle	uncheck	void	Promise
ElementHandle	waitForElementState	void	Promise
ElementHandle	waitForSelector	ElementHandle	Promise<null|ElementHandle<SVGElement|HTMLElement>>

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