Add Ruff linter checks

[marco-carvalho]

Overview

This PR introduces the integration of Ruff, a fast and efficient Python linter, into the yfinance project. The goal is to improve and maintain the code quality by enforcing style and coding standards.

Benefits

• Speed: Ruff's performance-oriented design allows for quick linting, making it an ideal tool for continuous integration environments.
• Readability and Maintenance: Enforcing a consistent coding style enhances code readability and maintainability.
• Error Prevention: Early detection of potential errors and code smells helps in maintaining the overall quality of the codebase.

Changes

• Applied Ruff checks to the existing codebase and made necessary adjustments to ensure compliance with the linter's rules.
• Created a new GitHub Action ruff.yml that triggers on pull requests to the master and main branches.

[ValueRaider]

This is much needed, thanks. But can you target dev branch instead? #1084 Just in case this broke something.

Probably good idea to trigger action on dev too.

[ValueRaider]

... and rebase to dev.

[ValueRaider]

@marco-carvalho I've rebased. Looks good to me, agree?

[ValueRaider]

question