Add per-vehicle customizable trunk size

[TonybynMp4]

Describe Pull request Requires PR in QB-Inventory ( https://github.com/qbcore-framework/qb-inventory/pull/287 ) Allows the customization of the trunk size in the Shared/vehicles.lua

https://github.com/qbcore-framework/qb-inventory/issues/278 https://github.com/qbcore-framework/qb-core/issues/680

Questions (please complete the following information):

Have you personally loaded this code into an updated qbcore project and checked all it's functionality? [yes] (Be honest) Does your code fit the style guidelines? [yes] Does your PR fit the contribution guidelines? [yes]