Add ability to download a complete "Learning Path" by providing the path URL

[AriaShishegaran]

Is your feature request related to a problem? Please describe. So I've been trying to download a complete path but had no success, you can guess the tedious task of finding each course's URL putting it inside a session of the downloader in terminal, opening a new session and enter another course. Describe the solution you'd like I would suggest creating a feature that enables the user to extract a whole learning path simply by putting in the path's URL, the software itself, recursively finds all course urls, adds a number to each course and makes it an ordered list of folders, and puts all these folders inside a main folder named by the learning path.

https://www.linkedin.com/learning/paths/becoming-a-six-sigma-black-belt

├─── Six Sigma Black Belt Learning Path
│   ├───01 - Course 01
│   ├───02 - Course 02