Add Codecov Integration and Configuration

[yamadashy]

This PR introduces Codecov integration to our CI/CD pipeline, enhancing our ability to track and visualize code coverage across the project. It also adds a custom Codecov configuration to tailor the tool's behavior to our project's needs.

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Files that changed from the base of the PR and between 117447da1b79c5bc2110ea54bd8298612c83daa0 and 442066ada3f61c99a68104efeacec51626d24c3f.

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[codecov-commenter]

Welcome to Codecov :tada:

Once you merge this PR into your default branch, you're all set! Codecov will compare coverage reports and display results in all future pull requests.

Thanks for integrating Codecov - We've got you covered :open_umbrella: