pre-commit hook for black and flake8

[dtemir]

Description

I think it would be a good idea to standardize the code contributed to LabGraph by having contributors use pre-commit hook that will automatically run black and flake8 when the user makes a commit.

That way as users keep committing changes, the new code will automatically follow good standards.

Fixes #74

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Checklist:

• New and existing unit tests pass locally with these changes?
• Has code been commented, particularly in hard-to-understand areas?
• Have you made corresponding changes to the documentation?

[dtemir]

@jfResearchEng please let me know if that'd be a useful change, but feel free to close the PR if you think it's unnecessary.

[dtemir]

One more idea:
If this would be useful, I think it would be a good idea to run this

Install pre-commit:

pip install pre-commit

Install the git hooks script:

pre-commit install

It uses a file called .pre-commit-config.yaml to create a Git hook .git/hooks/pre-commit

Apply the hook to all files:
https://pre-commit.com/#4-optional-run-against-all-the-files

pre-commit run --all-files

To level everything up first

[jfResearchEng]

When testing with mac, the following error appears: "pre-commit not found"
The error can be fixed using: pre-commit/pre-commit#1537

[jfResearchEng]

Shall a common error session be added for an improvement for mac users.