Add due date functionality

[codecov[bot]]

Codecov Report

Merging #44 (5701ee5) into main (f745080) will decrease coverage by 0.47%. The diff coverage is 96.58%.

@@            Coverage Diff             @@
##             main      #44      +/-   ##
==========================================
- Coverage   99.72%   99.24%   -0.48%     
==========================================
  Files          17       18       +1     
  Lines         721      795      +74     
  Branches      108      118      +10     
==========================================
+ Hits          719      789      +70     
- Misses          2        6       +4     

Impacted Files	Coverage Δ
src/aga/prize.py	0.00% <0.00%> (ø)
src/aga/cli/app.py	100.00% <100.00%> (ø)
src/aga/cli/ui.py	100.00% <100.00%> (ø)
src/aga/core.py	100.00% <100.00%> (ø)
src/aga/gradescope/main.py	100.00% <100.00%> (ø)
src/aga/gradescope/metadata.py	100.00% <100.00%> (ø)
src/aga/gradescope/schema.py	100.00% <100.00%> (ø)
src/aga/runner.py	100.00% <100.00%> (ø)
src/aga/score.py	100.00% <100.00%> (ø)

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