Add PyYAML to dependencies in pyproject.toml

[rjambrecic]

When you install:
pip install faststream[kafka]

and run:
faststream run application:app

you get:
ModuleNotFoundError: No module named 'yaml'

[Lancetnik]

We need no to add yaml to project dependencies: this is optional
I will review all imports to build project correct without it

[rjambrecic]

  File "/home/robert/fast-crypto/venv-crypto/lib/python3.8/site-packages/faststream/cli/docs/app.py", line 7, in <module>
    import yaml
ModuleNotFoundError: No module named 'yaml'

CLI import yaml. which is not found.

[Lancetnik]

I know, usage direct yaml is a mistake