* Fix module not launching on fresh install due to early import of coverage

- Move imports to type checking and other imports to function
  implementation.

Pip warns when installing package as the "root" user, this is generally the
case when running inside a container or a CI runner.

ENH: Hide warnings from pip when running it as "root"

Add pytest-xdist install to the dependencies to allowing
to run the tests in parallel using the "-n j" syntax.