feat(batch,agg): support array_agg for batch mode

[stdrc]

I hereby agree to the terms of the Singularity Data, Inc. Contributor License Agreement.

What's changed and what's your intention?

This PR adds support for array_agg in batch mode.

Checklist

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
• All checks passed in ./risedev check (or alias, ./risedev c)

Refer to a related PR or issue link (optional)

#4657

[BugenZhao]

LGTM

[BugenZhao]

Oops. Are we still using RwResult for aggregators? 🥵

[BugenZhao]

Opened a PR for this: #4873

[codecov]

Codecov Report

Merging #4862 (82a2d30) into main (aa6aebd) will increase coverage by 0.08%.
The diff coverage is 79.23%.

@@            Coverage Diff             @@
##             main    #4862      +/-   ##
==========================================
+ Coverage   73.80%   73.88%   +0.08%     
==========================================
  Files         871      873       +2     
  Lines      131635   132547     +912     
==========================================
+ Hits        97148    97934     +786     
- Misses      34487    34613     +126     

Flag	Coverage Δ
rust	73.88% <79.23%> (+0.08%)	⬆️

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

Impacted Files	Coverage Δ
src/batch/src/executor/mod.rs	72.30% <ø> (ø)
src/batch/src/rpc/service/task_service.rs	0.00% <0.00%> (ø)
src/cmd_all/src/playground.rs	0.00% <0.00%> (ø)
src/common/src/util/mod.rs	0.00% <ø> (ø)
src/compute/src/rpc/service/stream_service.rs	0.00% <0.00%> (ø)
src/compute/src/server.rs	0.00% <0.00%> (ø)
src/connector/src/source/datagen/source/reader.rs	85.30% <ø> (-0.41%)	⬇️
src/expr/src/expr/agg.rs	50.00% <ø> (ø)
src/expr/src/expr/expr_unary.rs	65.34% <0.00%> (-1.52%)	⬇️
src/expr/src/vector_op/agg/aggregator.rs	58.37% <0.00%> (-0.39%)	⬇️
... and 80 more

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