Updated to poetry 1.4.2 standards

Rearranged the package to match the standards for poetry 1.4.2, left `pytest-profiling`, `snakeviz` and `pytest-benchmark` in dev.dependencies. Also had to force the version of pytest to something below 7.2.0 or else `py` is not installed which makes `pytest-benchmark` fail since it is required but not a dependenct (see pytest-dev/pytest#10420)