refactor: add ability to have pipeline blockers in new streaming engine

[orlp]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 2.02899% with 338 lines in your changes missing coverage. Please review.

Project coverage is 80.69%. Comparing base (01a65f0) to head (b9faf4a).
Report is 16 commits behind head on main.

Files	Patch %	Lines
crates/polars-stream/src/execute.rs	0.00%	99 Missing ⚠️
crates/polars-stream/src/nodes/in_memory_map.rs	0.00%	52 Missing ⚠️
crates/polars-stream/src/graph.rs	0.00%	39 Missing ⚠️
crates/polars-stream/src/nodes/map.rs	0.00%	31 Missing ⚠️
...es/polars-stream/src/utils/late_materialized_df.rs	0.00%	26 Missing ⚠️
crates/polars-stream/src/nodes/in_memory_source.rs	0.00%	25 Missing ⚠️
crates/polars-stream/src/nodes/in_memory_sink.rs	0.00%	20 Missing ⚠️
crates/polars-stream/src/nodes/filter.rs	0.00%	12 Missing ⚠️
crates/polars-stream/src/nodes/select.rs	0.00%	12 Missing ⚠️
...rates/polars-stream/src/nodes/simple_projection.rs	0.00%	12 Missing ⚠️
... and 3 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17247      +/-   ##
==========================================
- Coverage   80.82%   80.69%   -0.13%     
==========================================
  Files        1466     1474       +8     
  Lines      192324   193128     +804     
  Branches     2745     2750       +5     
==========================================
+ Hits       155437   155849     +412     
- Misses      36384    36771     +387     
- Partials      503      508       +5     

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