feat: Support ANSI mode avg expr (int inputs)

[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?

TODO : Support ANSI mode for avg expression but for decimal inputs (which throw exception in ANSI mode unlike their integer counterparts)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.55%. Comparing base (f09f8af) to head (b444cba).
⚠️ Report is 800 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2817      +/-   ##
============================================
+ Coverage     56.12%   59.55%   +3.42%     
- Complexity      976     1376     +400     
============================================
  Files           119      167      +48     
  Lines         11743    15486    +3743     
  Branches       2251     2564     +313     
============================================
+ Hits           6591     9223    +2632     
- Misses         4012     4969     +957     
- Partials       1140     1294     +154     

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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

[coderfender]

@andygrove , @comphead . Please take a look whenever you get a chance . ANSI support for average is rather more relaxing compared to say 'Sum' because of the intermediate sum accumulation uses a float

[andygrove]

Thanks @coderfender

[coderfender]

Thank you for the approval @andygrove

[coderfender]

Fixing merge conflicts and test failures

[coderfender]

@comphead , I made changes per review and it gives me great pleasure to remove Spark's EvalMode import from aggregates.scala :)

[coderfender]

@comphead cpuld you please rerun the failed teats (due to OOM) ? Thank you