Feature Request: Support for Multiple Simultaneous Downloads (at least 3)

[OmarNazzal150]

Describe the feature

It would be great if Obtainium could support multiple simultaneous downloads, allowing at least three apps to download concurrently. This feature would align with the Google Play Store’s behavior, enabling users to update multiple apps in parallel rather than waiting for each download to complete one by one. This would significantly improve the experience for users who update several apps at a time, making the process faster and more efficient.

Describe alternatives you've considered (if applicable)

An alternative might be a customizable queue system where users could prioritize certain apps to update first. However, allowing multiple concurrent downloads seems like the most straightforward and effective solution, especially for users managing a large number of apps.

Additional context

This feature could align Obtainium with familiar download behavior in mainstream app stores, making it even more user-friendly for a broader audience. It would help reduce wait times and improve efficiency for users who rely on Obtainium for updates to multiple apps.