Migrate JSHandle APIs to async

[inancgumus]

What

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

Class	Method	Current k6 Return	PW return
JSHandle	asElement	ElementHandle|null	TextendsNode?ElementHandle:null
JSHandle	dispose	void	Promise
JSHandle	evaluate<R, Arg>	R	not found in Playwright
JSHandle	evaluateHandle<R, Arg>	JSHandle	not found in Playwright
JSHandle	getProperties	Map<string,JSHandle>	Promise<Map<string,JSHandle>>
JSHandle	jsonValue	any	Promise

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

Tasks

Beta Give feedback

1. Create documentation for the JSHandle class #764
   documentation good first issue hacktoberfest +3
2. APIs Migrated:
3. Release Notes:
4. Doc Updates:
5. Type definitions Updates