Add the convoy management system

[Debianov]

• [x] Convoy creation
• [ ] Convoy editing
• [ ] Sync with TruckersMP
• [ ] Time validation
• [ ] Time cache
• [x] The ability to vote for a convoy The optional feature. It allows members to vote for convoy times, etc.
• [ ] A route map autogeneration Based off https://map.truckersmp.com/ or something like that.
• [ ] The members tracking system

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• [ ] Custom flags