feat(stream): stream window join naming

[chenzl25]

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What's changed and what's your intention?

• If the first equal join key of stream hash join contains watermark columns of both sides, we call it StreamWindowJoin.

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• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
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Checklist For Reviewers

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Documentation

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Release note

[codecov]

Codecov Report

Merging #9076 (da738b7) into main (10190e8) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #9076      +/-   ##
==========================================
- Coverage   70.77%   70.77%   -0.01%     
==========================================
  Files        1195     1195              
  Lines      197724   197733       +9     
==========================================
+ Hits       139942   139944       +2     
- Misses      57782    57789       +7     

Flag	Coverage Δ
rust	70.77% <100.00%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
...ontend/src/optimizer/plan_node/stream_hash_join.rs	92.59% <100.00%> (+0.19%)	⬆️

... and 7 files with indirect coverage changes

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[st1page]

Maybe a little strange when user join two raw watermark column but in the most case is join two window 🤔 generally LGTM.