Add isPresent command to new Element API

[Aman-Pal07]

This pull request adds the missing isPresent command to the new Element API in Nightwatch.js. The isPresent command allows users to check if an element is present on the page.

I've implemented the isPresent command in a new file named isPresent.js in the lib/api/web-element/commands directory. The command uses the isElementPresent method from the Selenium WebDriver protocol to check for the presence of an element.

I've also added a JSDoc comment for the isPresent command to provide usage examples and documentation for users. Additionally, I've included tests for the new command to ensure its correctness and functionality.

This pull request resolves issue #4055.

[dikwickley]

@AMAN-CREATION

This will not work as there is no isElementPresent command in the method-mapping.js file.
Moreover, there seems to be code for other things as well (in find.js & findAll.js) and other things that should not be committed (like package-lock.json & snapshot.html)

Please test your solution. Thanks.