build: switch project to src-layout

[codecov[bot]]

Codecov Report

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

Project coverage is 99.60%. Comparing base (4be2a59) to head (b9aff3c). Report is 3 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #474 +/- ## ======================================= Coverage 99.60% 99.60% ======================================= Files 54 54 Lines 5510 5510 ======================================= Hits 5488 5488 Misses 22 22 ```

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