WIP: Async resource loading

[375gnu]

Based on: #2025. Logging requires changes to add mutexes. Now we cant show file names being loaded because this requires some kind of IPC, and will be ovewritten by another stream, so let's show a simple notification about databases being loaded.

[sonarqubecloud[bot]]

Quality Gate passed

The SonarCloud Quality Gate passed, but some issues were introduced.

3 New issues
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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