feat: Support ANSI mode avg expr

[coderfender]

Which issue does this PR close?

Closes #531

Rationale for this change

Support ANSI eval mode (for integer types) for average expression

What changes are included in this PR ?

1. Changes to avg implementation to support eval modes
2. Given that Spark considers Inf as a valid output and doesnt necessarily throw an exception, we follow the same approach in comet as well (essentially making eval mode's redundant for numeric inputs)

How are these changes tested?

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.07%. Comparing base (f09f8af) to head (444ce0e).
⚠️ Report is 722 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2817      +/-   ##
============================================
+ Coverage     56.12%   59.07%   +2.94%     
- Complexity      976     1459     +483     
============================================
  Files           119      165      +46     
  Lines         11743    15059    +3316     
  Branches       2251     2504     +253     
============================================
+ Hits           6591     8896    +2305     
- Misses         4012     4894     +882     
- Partials       1140     1269     +129     

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[andygrove]

@coderfender You can merge latest from main to fix the current CI failures

[coderfender]

@andygrove , Thank you . I rebased my feature branch with main. Please kick off CI whenever you get a chance . Thank you

[coderfender]

@andygrove , fixed issues with formatting and an unused import. Please kickoff the CI whenever you get a chance . Thank you