Feature Request: Keep the playlist order

[deepakmahakale]

Issue:
After downloading a playlist the order of the songs changes because of the file name.
We should add an option to keep the order of songs in the playlist?

Possible Solution:
We are already getting/downloading the songs in order. We can just add number prefix in front of the song name

Example:

Fot the following list
Instead of dynamite.mp3 make it 01-dynamite.mp3 so it remains at the first place.

https://github.com/vishaltelangre/music-dl/blob/master/lib/provider.js#L40

We can add a flag to make this behavior optional.

Album/Playlist: International Top 50 (/home/deepak/Music/2020/international-top-50)
→ (1/50) Dynamite
✓
→ (2/50) Savage Love (Laxed - Siren Beat)
✓
→ (3/50) Bella Ciao (HUGEL Remix)
✓
→ (4/50) Yummy
✓
→ (5/50) OMG What's Happening
✓

[vishaltelangre]

@deepakmahakale Sounds good to me. If you would like to work on it, please send a PR.