Add setup.py to fix workflow installation failures

[Copilot]

GitHub Actions workflows failed at pip install -e .[github_actions] because the repository lacked package configuration.

Changes

• setup.py: Package configuration for openwisp-utils with dependencies from requirements.txt and github_actions extras
• .gitignore: Standard Python exclusions (__pycache__/, *.egg-info/, build artifacts)

The package structure uses openwisp_utils/ as the module directory, matching existing workflow imports:

python -m openwisp_utils.issue_assignment_bot event.json

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Test Issue #2</issue_title>
<issue_description>"Can I work on this issue?"</issue_description>

<agent_instructions>why worflow is not working</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Test Issue #2 #3

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