[CHORE] Add check for stateful UDF outside of project

[kevinzwang]

Add a parameter to resolve_expr and its related functions to allow for stateful UDFs in the expression. This is set to false everywhere except for projects.

Additionally, df['column name'] used to call resolve_exprs to check for validity and returned its output, which would be problematic if there were wildcards in the expression. Now, I've created a function that only does the validity check, and DataFrame.__getitem__ would just return col(name), which will be actually resolved later in the builder.

[codspeed-hq]

CodSpeed Performance Report

Merging #2771 will degrade performances by 55.47%

_{Comparing kevin/resolve-expr-stateful-udf (3dbea60) with main (a97d871)}

Summary

❌ 2 regressions
✅ 14 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	kevin/resolve-expr-stateful-udf	Change
❌	test_count[1 Small File]	10.1 ms	22.6 ms	-55.47%
❌	test_show[100 Small Files]	55.8 ms	64.2 ms	-13%

[codecov]

Codecov Report

Attention: Patch coverage is 85.56701% with 14 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@a97d871). Learn more about missing BASE report.
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/daft-dsl/src/resolve_expr.rs	78.46%	14 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2771   +/-   ##
=======================================
  Coverage        ?   63.26%           
=======================================
  Files           ?     1001           
  Lines           ?   113771           
  Branches        ?        0           
=======================================
  Hits            ?    71980           
  Misses          ?    41791           
  Partials        ?        0           

Files with missing lines	Coverage Δ
daft/dataframe/dataframe.py	86.00% <100.00%> (ø)
src/daft-dsl/src/expr.rs	74.37% <100.00%> (ø)
src/daft-dsl/src/lib.rs	100.00% <100.00%> (ø)
src/daft-dsl/src/python.rs	94.12% <100.00%> (ø)
...rc/daft-plan/src/logical_ops/actor_pool_project.rs	40.27% <100.00%> (ø)
src/daft-plan/src/logical_ops/agg.rs	52.63% <100.00%> (ø)
src/daft-plan/src/logical_ops/explode.rs	79.54% <100.00%> (ø)
src/daft-plan/src/logical_ops/filter.rs	58.33% <100.00%> (ø)
src/daft-plan/src/logical_ops/join.rs	91.54% <100.00%> (ø)
src/daft-plan/src/logical_ops/pivot.rs	71.42% <100.00%> (ø)
... and 7 more

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