Homogenizing accessing active user

Adding result message on experiment parsing error

fix: Add migration for production DB

fix: Format graphql errors
fix: User undefined cause exception in users module
fix: Active user datashield and fix tos case senstive

Two new GraphQL routes added
Remove request injection into the engine service
Cleaning up engine interface (remove unused method, clean return types)
Unit tests

feat: Add File assets module (refactoring)