Add custom-scenario upload

[DontMash]

Is your feature request related to a problem? Please describe. A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
It would be nice to upload additional game content like custom scenarios to the vortex. This would allow more diverse gameplay experiences.

Describe the solution you'd like a clear and concise description of what you want to happen.
I'd like to upload and share a custom scenario the same way as a blueprint.

Describe alternatives you've considered A clear and concise description of any alternative solutions or features you've considered.
-/-

Additional context Add any other context or screenshots about the feature request here.
https://shapez2.wiki.gg/wiki/Custom_Game_Modes#Custom_Scenario_Presets

[DontMash]

https://github.com/ajv-validator/ajv