Issue #117: Generate frontend client from openapi specs

[mslowiak]

This PR adds the ability to generate frontend client API code automatically! :)

Cannot be merged till we adjust api.yaml with secured endpoints, base URL as localhost, and add login endpoint to the schema.

📦 Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [x] Breaking change (fix or feature that would cause existing functionality to not work as expected)

✅ Checklist

• [x] My code follows the code style of this project(Do your best to follow code styles. If none apply just skip this).
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.