refactor: optmize luaA_class_setup

[cnjhb]

The new luaA_class_setup preallocates the table, resulting in faster performance.
However, it can only accept arrays for methods and meta. Fortunately, all our luaA_class_setup use cases involve passing arrays.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.46%. Comparing base (39143f0) to head (1381e18).
⚠️ Report is 11 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4073      +/-   ##
==========================================
+ Coverage   90.44%   90.46%   +0.01%     
==========================================
  Files         939      939              
  Lines       60346    60350       +4     
  Branches     1145     1145              
==========================================
+ Hits        54582    54594      +12     
+ Misses       5254     5249       -5     
+ Partials      510      507       -3     

Files with missing lines	Coverage Δ
common/luaclass.c	87.89% <100.00%> (+0.19%)	⬆️
common/luaclass.h	100.00% <ø> (ø)

... and 2 files with indirect coverage changes

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[actionless]

thanks again!