Improve worker handling and statements

[barbosa89]

This change request introduces the following changes:

1. Manual creation of workers is eliminated.
2. The task of preparing statements is eliminated, as the execution of prepared statements is now handled by the execution task itself.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud