refactor(streaming): use async stream for dispatcher

[BugenZhao]

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

What's changed and what's your intention?

As title.

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)

• stream: migrate DispatchExecutor to ExecutorV2 #1479

[codecov]

Codecov Report

Merging #1955 (0db767d) into main (470a18a) will increase coverage by 0.01%.
The diff coverage is 86.84%.

@@            Coverage Diff             @@
##             main    #1955      +/-   ##
==========================================
+ Coverage   70.92%   70.94%   +0.01%     
==========================================
  Files         619      619              
  Lines       80106    80089      -17     
==========================================
  Hits        56816    56816              
+ Misses      23290    23273      -17     

Flag	Coverage Δ
rust	70.94% <86.84%> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
src/stream/src/executor/mod.rs	51.51% <ø> (ø)
src/stream/src/executor_v2/mod.rs	64.44% <ø> (-0.78%)	⬇️
src/stream/src/task/stream_manager.rs	0.00% <0.00%> (ø)
src/stream/src/executor/actor.rs	93.33% <88.88%> (-1.12%)	⬇️
src/stream/src/executor/dispatch.rs	76.07% <100.00%> (-0.25%)	⬇️
src/stream/src/executor/integration_tests.rs	95.67% <100.00%> (-0.08%)	⬇️
.../src/executor/managed_state/aggregation/extreme.rs	90.00% <0.00%> (-0.27%)	⬇️
src/connector/src/filesystem/file_common.rs	80.88% <0.00%> (+0.44%)	⬆️
src/storage/src/hummock/local_version_manager.rs	86.48% <0.00%> (+4.72%)	⬆️
src/meta/src/hummock/mock_hummock_meta_client.rs	52.00% <0.00%> (+5.33%)	⬆️

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[yezizp2012]

LGTM