Make allowscalar a macro with auto-world-age-increment

[Keno]

Goes along with JuliaLang/julia#56509

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.06%. Comparing base (14333ea) to head (0c1204a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #583   +/-   ##
=======================================
  Coverage   84.05%   84.06%           
=======================================
  Files          12       12           
  Lines        9170     9174    +4     
=======================================
+ Hits         7708     7712    +4     
  Misses       1462     1462           

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[ViralBShah]

Does this need to be backported? I assume not.

[Keno]

No