Add a counter under the execution table to show completed tasks.

[tobiasraabe]

Closes #250.

[codecov]

Codecov Report

Merging #252 (764cff7) into main (6e65106) will decrease coverage by 0.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #252      +/-   ##
==========================================
- Coverage   94.54%   94.43%   -0.12%     
==========================================
  Files          84       84              
  Lines        7078     7094      +16     
==========================================
+ Hits         6692     6699       +7     
- Misses        386      395       +9     

Flag	Coverage Δ
end_to_end	80.25% <79.06%> (-0.16%)	⬇️
integration	42.02% <34.88%> (-0.02%)	⬇️
unit	69.74% <100.00%> (+0.06%)	⬆️

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Impacted Files	Coverage Δ
src/_pytask/live.py	98.82% <100.00%> (+0.08%)	⬆️
tests/test_live.py	100.00% <100.00%> (ø)
src/_pytask/console.py	88.54% <0.00%> (-7.30%)	⬇️
src/_pytask/execute.py	95.23% <0.00%> (-1.20%)	⬇️

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