feat(ci): add code coverage support with lcov and Codecov integration

[LiYiMing-lg]

Description

This PR adds code coverage support to the CI pipeline by integrating lcov/gcov for coverage reporting and Codecov for visualization.

Changes

• Added coverage tools installation (lcov, gcovr)
• Modified CMake configuration to enable coverage compilation
• Added coverage report generation using lcov
• Integrated Codecov action for automated coverage reporting
• Coverage reports will be generated for each PR and main branch builds

Testing

• Coverage data is collected during make test execution
• Reports are uploaded to Codecov for better visualization

[gemini-code-assist[bot]]

[!NOTE] Gemini is unable to generate a summary for this pull request due to the file types involved not being currently supported.

[stmatengss]

Could you update this PR to pass CI? thx. @LiYiMing-lg