Alternative to exec'ed code for building routine functions #40
Description
Typer looks at function signatures and we can't construct those at runtime without writing and exec-ing code strings. We should find a work around because this is not ideal. Specifically it makes testing harder because this means the routine command is built once during import. When using override_settings in tests we have to use importlib to force the module to be reloaded. This just impacts tests, but we should try to find a better way to do this that builds the command when it is run - not on import which will break routines anytime the command is import before settings are ready.