Ability to `setup()` a server-only environment for testing

[acidjazz]

Describe the feature

Allow the option to only provide server functionality for faster testing in situations where the API is priority for coverage

setup({
  serverOnly: true
})

Additional information

• Would you be willing to help implement this feature?
• Could this feature be implemented as a module?

Final checks

• Read the contribution guide.
• Check existing discussions and issues.