Migrate Mouse APIs to async

[inancgumus]

What

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

Class	Method	Current k6 Return	PW return
Mouse	click	void	Promise
Mouse	dblclick	void	Promise
Mouse	down	void	Promise
Mouse	move	void	Promise
Mouse	up	void	Promise

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

Tasks

Beta Give feedback

1. Prepare Mouse for async migration #1322
   async refactor stability +3
   
2. Async Mouse #1323
   async +1
   
3. Update to Async Mouse k6-docs#1594
   Area: browser +1
   
4. Create documentation for the Mouse class #766
   documentation good first issue hacktoberfest +3
   
5. Update Mouse and Keyboard interface to return Promises k6-DefinitelyTyped#45
   +0
6. Add release notes