feat: support incremental avg

[Yisaer]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 67.85714% with 18 lines in your changes missing coverage. Please review.

Project coverage is 71.37%. Comparing base (b15cd40) to head (ffb6449).
Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/binder/function/funcs_inc_agg.go	67.86%	12 Missing and 6 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3457      +/-   ##
==========================================
- Coverage   71.39%   71.37%   -0.03%     
==========================================
  Files         412      414       +2     
  Lines       47275    47448     +173     
==========================================
+ Hits        33751    33862     +111     
- Misses      10893    10939      +46     
- Partials     2631     2647      +16     

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