refactor test framework

• API documentation should be automatically generated from tests
  • Authentication
  • Projects
  • Configuration
  • Converter
  • Users
  • Plugins
  • Files
  • Genomics
  • Mesh
  • Taxonomy
• local unit tests should be fast and run on the in memory database (+ tests should be run on postgres in the CI)
• there should be test database created that could be used for tests
• create environment for testing plugins