Add a dynamic spinner to show the progress during collection.

[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 #96 (3cc0fec) into main (05b6dd1) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

❗ Current head 3cc0fec differs from pull request most recent head 1c39883. Consider uploading reports for the commit 1c39883 to get more accurate results

@@            Coverage Diff             @@
##             main      #96      +/-   ##
==========================================
- Coverage   90.14%   90.12%   -0.03%     
==========================================
  Files          61       60       -1     
  Lines        5144     5132      -12     
==========================================
- Hits         4637     4625      -12     
  Misses        507      507              

Flag	Coverage Δ
end_to_end	77.41% <100.00%> (-0.06%)	⬇️
integration	41.50% <30.76%> (-0.12%)	⬇️
unit	66.36% <65.38%> (-0.08%)	⬇️

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Impacted Files	Coverage Δ
src/_pytask/cli.py	100.00% <ø> (ø)
src/_pytask/collect.py	96.96% <100.00%> (-0.03%)	⬇️
src/_pytask/console.py	96.42% <100.00%> (-0.80%)	⬇️
src/_pytask/debugging.py	30.41% <100.00%> (+0.32%)	⬆️
tests/test_debugging.py	34.13% <100.00%> (+3.04%)	⬆️

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