perf: [WIP] [iceberg] Per-partition FileScanTasks

[mbutrovich]

Which issue does this PR close?

Closes #.

Rationale for this change

What changes are included in this PR?

How are these changes tested?

[codecov-commenter]

Codecov Report

❌ Patch coverage is 86.21908% with 39 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.09%. Comparing base (f09f8af) to head (89c780c).
⚠️ Report is 901 commits behind head on main.

Files with missing lines	Patch %	Lines
.../comet/serde/operator/CometIcebergNativeScan.scala	86.97%	21 Missing and 4 partials ⚠️
...cala/org/apache/spark/sql/comet/CometExecRDD.scala	78.18%	9 Missing and 3 partials ⚠️
...ain/scala/org/apache/comet/CometExecIterator.scala	75.00%	1 Missing ⚠️
...n/scala/org/apache/spark/sql/comet/operators.scala	96.87%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3297      +/-   ##
============================================
+ Coverage     56.12%   60.09%   +3.97%     
- Complexity      976     1462     +486     
============================================
  Files           119      175      +56     
  Lines         11743    16268    +4525     
  Branches       2251     2690     +439     
============================================
+ Hits           6591     9777    +3186     
- Misses         4012     5138    +1126     
- Partials       1140     1353     +213     

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