[FEATURE REQUEST] Develop unified backend

### 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](https://github.com/marticliment/WingetUI/issues/new?assignees=marticliment&labels=enhancement&projects=&template=enhancement-improvement.yml&title=%5BENHANCEMENT%5D+%28Enter+your+description+here%29).

### 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](https://github.com/marticliment/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

.