refactor: typescript integration in tutorials.js file

[niladrix719]

Fixes #280

Describe the changes you have made in this PR -

1. added Driver.Step interface for the objects
2. used ? operator for type safety
3. added as HTMLElement when working with html elements to access the properties
4. localStorage.setItem('tutorials_tour_done', 'true') added true as String here because localStorage takes both parameter as String

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