Add flake8 config and GitHub Actions workflow for linting.Add python linter

[fahdalkhulaifi]

This pull request adds automated Python code quality checks to the project by:

Adding a .flake8 configuration file to enforce coding style rules (e.g., max line length, excluded folders).

Adding a GitHub Actions workflow (.github/workflows/lint.yml) that runs flake8 on every push and pull request to the develop branch.

The workflow helps catch style and syntax issues early, improving code quality and consistency.

This addresses the issue #68 "Add python linter" by integrating linting into the CI process without auto-formatting, so developers can fix lint errors themselves.

[fahdalkhulaifi]

Hi! This PR adds flake8 linting configuration and a GitHub Actions workflow as discussed in issue #68. Please review when you have a chance. Thanks!