[feat]: add codecov config and ignore mocks/* code coverage

[komer3]

General:

• [ ] Have you removed all sensitive information, including but not limited to access keys and passwords?
• [ ] Have you checked to ensure there aren't other open or closed Pull Requests for the same bug/feature/question?

Pull Request Guidelines:

1. [ ] Does your submission pass tests?
2. [ ] Have you added tests?
3. [ ] Are you addressing a single feature in this PR?
4. [ ] Are your commits atomic, addressing one change per commit?
5. [ ] Are you following the conventions of the language?
6. [ ] Have you saved your large formatting changes for a different PR, so we can focus on your work?
7. [ ] Have you explained your rationale for why this feature is needed?
8. [ ] Have you linked your PR to an open issue

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 49.59%. Comparing base (81f2174) to head (4112609).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #259 +/- ## ========================================== - Coverage 51.64% 49.59% -2.06% ========================================== Files 27 22 -5 Lines 2153 1587 -566 ========================================== - Hits 1112 787 -325 + Misses 991 750 -241 Partials 50 50 ```

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[amold1]

I'm cool with merging this but while we are at it, you mind adding

github_checks:
    annotations: false