Test coverage with codecov

Test Coverage with Codecov

Executing make test runs the test suite and generates a coverage report in the form of coverage.xml. Integration with Codecov has been added to the CI/CD pipeline for comprehensive test coverage analysis.

To enable Codecov:

1. Sign up at Codecov.io using your GitHub account.
2. Include a codecov.yaml configuration file in your repository with the following default settings:
3. Generate a new token at Codecov.io and add it to the github secret as CODECOV_TOKEN.

# Badge color changes from red to green between 70% and 100%
# PR pipeline fails if codecov falls with 1%

coverage:
    range: 70..100
    round: down
    precision: 1
    status:
        project:
            default:
                target: auto
                threshold: 1%