Deprecate stage_assn

[SamirDroubi]

Addresses issue #160

[codecov-commenter]

Codecov Report

Merging #300 (749f726) into master (e4d51dc) will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #300      +/-   ##
==========================================
- Coverage   86.37%   86.33%   -0.05%     
==========================================
  Files          73       73              
  Lines       16321    16289      -32     
==========================================
- Hits        14098    14063      -35     
- Misses       2223     2226       +3     

Impacted Files	Coverage Δ
src/exo/API_scheduling.py	86.63% <ø> (-0.52%)	⬇️
src/exo/LoopIR_scheduling.py	90.88% <ø> (-0.08%)	⬇️
src/exo/stdlib/scheduling.py	77.77% <ø> (ø)
apps/x86/sgemm/sgemm.py	99.56% <100.00%> (+<0.01%)	⬆️
tests/test_neon.py	77.17% <100.00%> (-1.18%)	⬇️
tests/test_x86.py	100.00% <100.00%> (ø)

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[yamaguchi1024]

Great, thanks!