[FEAT] Add basic list aggregations

[kevinzwang]

As requested in #1977

List aggregations:

• sum
• count
• mean
• min
• max

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.26%. Comparing base (c2db062) to head (005e434).
Report is 52 commits behind head on main.

❗ Current head 005e434 differs from pull request most recent head ce971a8. Consider uploading reports for the commit ce971a8 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2032      +/-   ##
==========================================
+ Coverage   84.70%   85.26%   +0.55%     
==========================================
  Files          62       68       +6     
  Lines        6768     7268     +500     
==========================================
+ Hits         5733     6197     +464     
- Misses       1035     1071      +36     

Files	Coverage Δ
daft/expressions/expressions.py	92.04% <100.00%> (+0.52%)	⬆️
daft/series.py	92.88% <ø> (-0.17%)	⬇️

... and 16 files with indirect coverage changes

[kevinzwang]

Updated the code to just slice the series and use the Series aggregations on each list. Much cleaner code and consolidates the logic to one point which I like, but unsure if there are performance issues with doing this. From what I can tell there is nothing that will require significant additional runtime or copies.

[samster25]

we probably want to have a concat that takes in an iterator of Series for this. materializing all the Series then concating it is going to be slow.

[kevinzwang]

tabled until we create an ArrayBuilder so that we don't have to fully materialize the Series objects to concat