[FEATURE REQUEST] Develop unified backend

[snapsl]

Please confirm these before moving forward.

• [x] I have searched for my feature proposal and have not found a work-in-progress/duplicate/resolved/discarded issue.
• [x] This proposal is a completely new feature. If you want to suggest an improvement or an enhancement, please use this template.

Describe the new feature

As UniGet has continued to grow, more features have been developed that require to store data externally. To enhance the functionality and maintainability of UniGet, I propose developing an API backend that unifies the following aspects:

• crash logs
• telemetry
• package rankings
• app preview images
• app icons

The statistics server could be used as a starting point. However, it would be useful to use a actual database as data storage.

The development of this API as an open source project would increase the popularity and active participation in the opt-in approach.

Describe how this new feature could help users

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