refactor(rust): Extend new streaming engine with some initial nodes

[orlp]

This is very much work-in-progress, but don't want to create very large PRs.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 269 lines in your changes missing coverage. Please review.

Project coverage is 80.97%. Comparing base (5bb28b4) to head (7c55955).

Files	Patch %	Lines
crates/polars-stream/src/nodes/in_memory_sink.rs	0.00%	56 Missing ⚠️
crates/polars-stream/src/nodes/in_memory_source.rs	0.00%	43 Missing ⚠️
crates/polars-stream/src/morsel.rs	0.00%	36 Missing ⚠️
crates/polars-stream/src/graph.rs	0.00%	31 Missing ⚠️
crates/polars-stream/src/nodes/filter.rs	0.00%	29 Missing ⚠️
...rates/polars-stream/src/nodes/simple_projection.rs	0.00%	26 Missing ⚠️
crates/polars-stream/src/physical_plan/to_graph.rs	0.00%	17 Missing ⚠️
crates/polars-stream/src/skeleton.rs	0.00%	16 Missing ⚠️
crates/polars-stream/src/lib.rs	0.00%	5 Missing ⚠️
crates/polars-stream/src/execute.rs	0.00%	4 Missing ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16940      +/-   ##
==========================================
- Coverage   81.09%   80.97%   -0.13%     
==========================================
  Files        1435     1445      +10     
  Lines      189567   189810     +243     
  Branches     2712     2712              
==========================================
- Hits       153736   153691      -45     
- Misses      35331    35619     +288     
  Partials      500      500              

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