[Enhancement] Parallel download

[Pheggas]

🚀 Enhancement Request

Is your enhancement request related to a problem? Please describe.

When downloading large albums with high potential download speeds, those speeds can't be used because of serial downloading the songs one by one. Parallel download would fix this.

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Describe the solution you'd like

It would automatically start all the downloads at once (or limited number of downloads that are set in optional settings yml or GUI)

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Describe alternatives you've considered

Each download would be performed with different tokens. So if i want to download let's say album of 15 songs, i would set max of 5 parallel downloads and i would also set user ID and token for each of this parallel downloads so it would reduce the risk of getting banned.

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Additional context

N/A

[orbittwz]

way back in #6 this request is the same idea... should be merged