Fix a circular import error created by #197.

[tobiasraabe]

Changes

Move the import of cli.py to the lowest position in pytask/__init__.py.

When cli is imported, plugins will be imported before other modules like pytask.mark have been imported. But, plugins will also try to import from pytask import Mark which will cause the circular import error.

I am not sure whether this is a permanent fix.

[codecov]

Codecov Report

Merging #225 (4ca64fc) into main (ae882f2) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #225   +/-   ##
=======================================
  Coverage   94.17%   94.17%           
=======================================
  Files          75       75           
  Lines        6713     6713           
=======================================
  Hits         6322     6322           
  Misses        391      391           

Flag	Coverage Δ
end_to_end	79.78% <100.00%> (ø)
integration	41.85% <100.00%> (ø)
unit	70.40% <100.00%> (ø)

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Impacted Files	Coverage Δ
src/pytask/__init__.py	100.00% <100.00%> (ø)

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