refactor(streaming): use row iterator of StreamChunk in top-n

[BugenZhao]

Signed-off-by: Bugen Zhao i@bugenzhao.com

What's changed and what's your intention?

As title. So that there's no need to compact the stream chunk.

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)

• streaming: use StreamChunk::rows to iterate on rows #1839

[codecov]

Codecov Report

Merging #1869 (41fd07e) into main (37ae902) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1869      +/-   ##
==========================================
- Coverage   70.89%   70.86%   -0.03%     
==========================================
  Files         611      611              
  Lines       79623    79595      -28     
==========================================
- Hits        56447    56408      -39     
- Misses      23176    23187      +11     

Flag	Coverage Δ
rust	70.86% <100.00%> (-0.03%)	⬇️

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

Impacted Files	Coverage Δ
src/common/src/array/stream_chunk_iter.rs	98.78% <100.00%> (+5.10%)	⬆️
src/stream/src/executor_v2/hop_window.rs	80.55% <100.00%> (-1.03%)	⬇️
src/stream/src/executor_v2/top_n.rs	90.56% <100.00%> (-0.08%)	⬇️
src/stream/src/executor_v2/top_n_appendonly.rs	93.32% <100.00%> (+0.57%)	⬆️
src/meta/src/hummock/mock_hummock_meta_client.rs	46.66% <0.00%> (-5.34%)	⬇️
src/storage/src/hummock/local_version_manager.rs	81.75% <0.00%> (-4.73%)	⬇️
src/common/src/array/data_chunk_iter.rs	84.29% <0.00%> (-1.58%)	⬇️
src/connector/src/filesystem/file_common.rs	80.44% <0.00%> (-0.45%)	⬇️
src/common/src/types/ordered_float.rs	23.70% <0.00%> (+0.19%)	⬆️
.../src/executor/managed_state/aggregation/extreme.rs	90.16% <0.00%> (+0.26%)	⬆️
... and 1 more

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