Add dependencies to setup.py and select loky as default backend.

[tobiasraabe]

Changes

Provide a description and/or bullet points to describe the changes in this PR.

Todo

• Reference issues which can be closed due to this PR with "Closes #x".
• Review whether the documentation needs to be updated.
• Document PR in docs/changes.rst.

[codecov]

Codecov Report

Merging #17 (f8eb340) into main (e60c31b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #17   +/-   ##
=======================================
  Coverage   97.45%   97.45%           
=======================================
  Files          13       13           
  Lines         314      314           
=======================================
  Hits          306      306           
  Misses          8        8           

Flag	Coverage Δ
end_to_end	89.80% <ø> (ø)
integration	50.31% <ø> (ø)
unit	53.50% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update e60c31b...056f3a1. Read the comment docs.