feat(meta): generate delta join plan

[skyzh]

Signed-off-by: Alex Chi iskyzh@gmail.com

What's changed and what's your intention?

• Add a new executor union. Will implement later.
• Generate delta-join plan.
• If an exchange node has been processed, its inputs will be removed from fragment.

Not yet tested, will have follow-up PRs.

Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests

Refer to a related PR or issue link (optional)

close #1807
ref #719

[codecov]

Codecov Report

Merging #1871 (1b0b6bc) into main (0f6f2ac) will decrease coverage by 0.18%.
The diff coverage is 15.62%.

@@            Coverage Diff             @@
##             main    #1871      +/-   ##
==========================================
- Coverage   70.91%   70.72%   -0.19%     
==========================================
  Files         611      611              
  Lines       79668    79898     +230     
==========================================
+ Hits        56494    56506      +12     
- Misses      23174    23392     +218     

Flag	Coverage Δ
rust	70.72% <15.62%> (-0.19%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/frontend/src/catalog/schema_catalog.rs	81.94% <ø> (ø)
src/meta/src/stream/graph/stream_graph.rs	61.94% <0.00%> (-0.42%)	⬇️
src/meta/src/stream/rewrite/delta_join.rs	0.00% <0.00%> (ø)
src/meta/src/stream/fragmenter.rs	85.90% <72.00%> (+2.78%)	⬆️
src/meta/src/stream/graph/fragment_graph.rs	97.10% <100.00%> (+0.15%)	⬆️
src/connector/src/filesystem/file_common.rs	80.44% <0.00%> (-0.45%)	⬇️

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[yezizp2012]

LGTM~