Break assume return into a separate hook in the generalized hook framework

[yuxincs]

This PR refactors the logic that returns nonnil producer in the new generalized hook framework into a new strongly-typed hook for better maintainability and slightly better performance (fewer look ups in all hook points). It introduces no functionality changes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.61%. Comparing base (6884546) to head (10acb30).

Additional details and impacted files

@@                   Coverage Diff                    @@
##           yuxincs/generalize-hook     #279   +/-   ##
========================================================
  Coverage                    87.60%   87.61%           
========================================================
  Files                           63       64    +1     
  Lines                         7916     7922    +6     
========================================================
+ Hits                          6935     6941    +6     
  Misses                         799      799           
  Partials                       182      182           

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[github-actions]

Golden Test

Note

✅ NilAway errors reported on standard libraries are identical.

3271 errors on base branch (yuxincs/generalize-hook, 6884546)
3271 errors on test branch (a2e8614)