refactor: Introduce a Sink Node trait in the new streaming engine

[coastalwhite]

This will wrap all the sink nodes and allow generic functionality using the sink nodes.

[codecov]

Codecov Report

Attention: Patch coverage is 0.44643% with 446 lines in your changes missing coverage. Please review.

Project coverage is 79.99%. Comparing base (c37e482) to head (8427e9e).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/polars-stream/src/nodes/io_sinks/mod.rs	0.00%	151 Missing ⚠️
crates/polars-stream/src/nodes/io_sinks/parquet.rs	0.00%	98 Missing ⚠️
crates/polars-stream/src/nodes/io_sinks/ipc.rs	0.00%	90 Missing ⚠️
crates/polars-stream/src/nodes/io_sinks/csv.rs	0.00%	60 Missing ⚠️
crates/polars-stream/src/nodes/io_sinks/json.rs	0.00%	46 Missing ⚠️
crates/polars-stream/src/nodes/io_sources/mod.rs	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #21458      +/-   ##
==========================================
- Coverage   80.02%   79.99%   -0.03%     
==========================================
  Files        1597     1598       +1     
  Lines      229111   229196      +85     
  Branches     2620     2620              
==========================================
+ Hits       183338   183347       +9     
- Misses      45174    45250      +76     
  Partials      599      599              

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