Added black formater for the code with code-checker on pull (#1610)

* black

Added throught black.toml other options are hard so far

No caching for black github action

Moved from black.toml to pyproject.toml

Exclude not only yml but also yaml

Update pyproject.toml

Co-authored-by: Thomas Johansen <thomasjo@gmail.com>

Update .github/workflows/code-formatting-check.yml

mergify

Remove formating check

E231 error ignoring because of black formating

Updated CONTRIBUTING to the master

* Update .github/workflows/code-formatting-check.yml

* Bump black to 19.10b0 version

* resolved incorrect merge of CONTRIBUTING,

Black skipping string normalization

* Minor fixes in CONTRIBUTING, two typos

* Update setup.cfg

* chlog

Co-authored-by: Jirka Borovec <Borda@users.noreply.github.com>
Co-authored-by: Jirka <jirka@pytorchlightning.ai>