Upgrade to Lumen

[cosminbosutar]

Investigate the need to upgrade to Lumen https://lumen.laravel.com/

[Utwo]

I don't think it's worth the change to Lumen. Maybe if we run some benchmark test we will have a clear picture but I think for the moment, Laravel it's a solid choice.

[RaduCStefanescu]

@gheorghelupu17 what is your input on this issue? Do we still need it open?