feat: add object_concat function

[Rui-Gan]

No description provided.

[codecov]

Codecov Report

Patch coverage: 81.25% and project coverage change: +0.08% 🎉

Comparison is base (3a72679) 61.65% compared to head (b1b9e90) 61.73%.
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2149      +/-   ##
==========================================
+ Coverage   61.65%   61.73%   +0.08%     
==========================================
  Files         282      285       +3     
  Lines       33475    33595     +120     
==========================================
+ Hits        20636    20738     +102     
- Misses      10886    10903      +17     
- Partials     1953     1954       +1     

Files Changed	Coverage Δ
internal/binder/function/funcs_obj.go	85.98% <81.25%> (-0.83%)	⬇️

... and 18 files with indirect coverage changes

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[ngjaying]

Please add the doc