refactor: Improve IPC sink node parallelism

[coastalwhite]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 21.21212% with 208 lines in your changes missing coverage. Please review.

Project coverage is 79.79%. Comparing base (c1e6be9) to head (0a180d8).
Report is 12 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/polars-stream/src/nodes/io_sinks/ipc.rs	0.00%	180 Missing ⚠️
crates/polars-stream/src/nodes/io_sinks/mod.rs	0.00%	17 Missing ⚠️
crates/polars-core/src/frame/column/mod.rs	0.00%	8 Missing ⚠️
crates/polars-arrow/src/io/ipc/write/writer.rs	40.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #21505      +/-   ##
==========================================
+ Coverage   79.71%   79.79%   +0.07%     
==========================================
  Files        1605     1592      -13     
  Lines      230127   229390     -737     
  Branches     2623     2623              
==========================================
- Hits       183441   183035     -406     
+ Misses      46081    45750     -331     
  Partials      605      605              

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