[FEAT] Add initial Spark Connect support

[andrewgazelka]

Implements basic Spark Connect functionality in Daft with the following:

• Add daft-connect crate to handle Spark Connect protocol
• Implement configuration management via Spark Connect API
• Add Python bindings with connect_start() function
• Add integration tests for config operations

Currently supports:

• Basic session management
• Config operations (Set, Get, GetWithDefault, GetOption, GetAll, Unset)
• Error handling and status reporting

Notable changes:

• New dependency on spark-connect protocol
• Added tracing for debugging and monitoring
• Integration with existing Daft infrastructure

Some operations like execute_plan, analyze_plan, and artifact handling are
currently unimplemented and will return appropriate error messages.

[codspeed-hq]

CodSpeed Performance Report

Merging #3261 will degrade performances by 34.58%

_{Comparing andrew/connect-config (a3c6037) with main (f290f40)}

Summary

⚡ 1 improvements
❌ 2 regressions
✅ 14 untouched benchmarks

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

Benchmarks breakdown

	Benchmark	main	andrew/connect-config	Change
❌	test_count[1 Small File]	3.3 ms	4 ms	-17.44%
❌	test_iter_rows_first_row[100 Small Files]	177.3 ms	271 ms	-34.58%
⚡	test_show[100 Small Files]	51.1 ms	42.1 ms	+21.5%

[codecov]

Codecov Report

Attention: Patch coverage is 69.48052% with 94 lines in your changes missing coverage. Please review.

Project coverage is 77.78%. Comparing base (f290f40) to head (a3c6037).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/daft-connect/src/lib.rs	58.67%	50 Missing ⚠️
src/daft-connect/src/main.rs	0.00%	33 Missing ⚠️
src/daft-table/src/lib.rs	0.00%	8 Missing ⚠️
src/daft-connect/src/config.rs	95.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3261      +/-   ##
==========================================
+ Coverage   76.07%   77.78%   +1.70%     
==========================================
  Files         644      650       +6     
  Lines       81581    80350    -1231     
==========================================
+ Hits        62065    62501     +436     
+ Misses      19516    17849    -1667     

Files with missing lines	Coverage Δ
src/daft-connect/src/session.rs	100.00% <100.00%> (ø)
src/daft-connect/src/util.rs	100.00% <100.00%> (ø)
src/daft-local-execution/src/lib.rs	92.85% <ø> (ø)
src/lib.rs	95.77% <100.00%> (+0.06%)	⬆️
src/daft-connect/src/config.rs	95.00% <95.00%> (ø)
src/daft-table/src/lib.rs	88.59% <0.00%> (-1.17%)	⬇️
src/daft-connect/src/main.rs	0.00% <0.00%> (ø)
src/daft-connect/src/lib.rs	58.67% <58.67%> (ø)

... and 27 files with indirect coverage changes