[tool] feat(ci): add codecov (#194)

[mariot]

Proposed changes

Testing Instructions

1. Step-by-step how to test
2. Environment or config notes

Related issues

• Closes Integrate Codecov for test coverage reporting #194

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality
• For bug fix -> I implemented a test that covers the bug

Further comments

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (main@d91a8a0). Learn more about missing BASE report.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #196   +/-   ##
=======================================
  Coverage        ?   70.39%           
=======================================
  Files           ?       58           
  Lines           ?     2327           
  Branches        ?        0           
=======================================
  Hits            ?     1638           
  Misses          ?      689           
  Partials        ?        0           

Flag	Coverage Δ
connectors	70.39% <ø> (?)

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