feat(common): introduce Serial as Scalar and ScalarRef

[shanicky]

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What's changed and what's your intention?

This pull request adds a new module, serial_array, to the src/common/src/array/ directory, which contains an implementation for the Serial type. Serial has been included in the list of Scalar variants in src/common/src/types/mod.rs, with corresponding implementations for Scalar and ScalarRef. The ScalarRefImpl's implementation of ToBinary now includes Serial in the match statement. Additionally, serialize_scalar() in src/common/src/util/value_encoding/mod.rs has been modified to handle Serial.

Checklist For Contributors

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
  - [ ] I have added fuzzing tests or opened an issue to track them. (Optional, recommended for new SQL features Sqlsmith: Sql feature generation #7934).
• I have demonstrated that backward compatibility is not broken by breaking changes and created issues to track deprecated features to be removed in the future. (Please refer to the issue)
• All checks passed in ./risedev check (or alias, ./risedev c)

Checklist For Reviewers

• I have requested macro/micro-benchmarks as this PR can affect performance substantially, and the results are shown.

Documentation

• My PR DOES NOT contain user-facing changes.

Click here for Documentation

Types of user-facing changes

Please keep the types that apply to your changes, and remove the others.

• Installation and deployment
• Connector (sources & sinks)
• SQL commands, functions, and operators
• RisingWave cluster configuration changes
• Other (please specify in the release note below)

Release note

[xiangjinwu]

nit: mod serial_array and pub use those needed.

[codecov]

Codecov Report

Merging #8327 (b5e8859) into main (870cbf7) will decrease coverage by 0.03%.
The diff coverage is 2.43%.

@@            Coverage Diff             @@
##             main    #8327      +/-   ##
==========================================
- Coverage   71.57%   71.54%   -0.03%     
==========================================
  Files        1130     1131       +1     
  Lines      184113   184154      +41     
==========================================
- Hits       131775   131759      -16     
- Misses      52338    52395      +57     

Flag	Coverage Δ
rust	71.54% <2.43%> (-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/mod.rs	73.06% <ø> (ø)
src/common/src/array/serial_array.rs	0.00% <0.00%> (ø)
src/common/src/types/to_binary.rs	37.50% <0.00%> (-0.80%)	⬇️
src/common/src/util/value_encoding/mod.rs	96.49% <0.00%> (-0.57%)	⬇️
src/common/src/types/mod.rs	73.16% <50.00%> (-0.16%)	⬇️
src/batch/src/executor/group_top_n.rs	68.23% <0.00%> (-6.48%)	⬇️
src/source/src/row_id.rs	90.90% <0.00%> (-1.14%)	⬇️
src/meta/src/hummock/mock_hummock_meta_client.rs	64.94% <0.00%> (-0.52%)	⬇️
...frontend/src/scheduler/hummock_snapshot_manager.rs	60.00% <0.00%> (-0.48%)	⬇️
src/common/src/types/ordered_float.rs	30.87% <0.00%> (-0.20%)	⬇️
... and 5 more

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