[PERF] Iceberg Partition Pruning

[samster25]

• Implements Partition Transforms which map source fields to partition fields
• Implements Partition Filtering when creating scan tasks
• Implements Predicate to Partition Filter rewriting
• Allow Iceberg Scan to leverage partition filtering
• Implements EmptyScan which kicks in whenever we have no files to scan
• Fixes bug with incorrect length when we have a predicate and a limit in a ScanTask
• Fixes bug with df.num_partitions() where we didn't optimize the logical plan before computing the number of partitions

[codecov]

Codecov Report

Attention: 42 lines in your changes are missing coverage. Please review.

Comparison is base (b4f3ae1) 85.19% compared to head (d6d7cc9) 84.76%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1688      +/-   ##
==========================================
- Coverage   85.19%   84.76%   -0.43%     
==========================================
  Files          55       55              
  Lines        5518     5554      +36     
==========================================
+ Hits         4701     4708       +7     
- Misses        817      846      +29     

Files	Coverage Δ
daft/dataframe/dataframe.py	87.28% <100.00%> (ø)
daft/execution/physical_plan.py	93.40% <ø> (ø)
daft/io/scan.py	0.00% <0.00%> (ø)
daft/execution/rust_physical_plan_shim.py	93.10% <61.53%> (-5.57%)	⬇️
daft/iceberg/iceberg_scan.py	0.00% <0.00%> (ø)