✨ Added the --app-dir param to specify the sources directory

[mykolasolodukha]

What?

• Add the --app-dir/-d params in CLI to add the directory to add to sys.path before trying to import_module(...).
• Add the --app-dir/-d to both the Worker and Scheduler.

Why?

• To support the projects that have a separate sources directory.

How to test?

• When something lives in ./my_src/my_module.py, it should be imported with --app-dir my_src my_module:my_broker.

[s3rius]

Thank for your contribution. Please run pre-commit run -a to fix those errors.

[s3rius]

I'll fix it in main.