feat(function): alias array_to_string to array_join

[lmatz]

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What's changed and what's your intention?

As per the title, the name array_join is widely used by databricks, presto, clickhouse, starrocks and firebolt, etc.

Checklist

- [ ] 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).
  - [ ] 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)

Documentation

Click here for Documentation

Types of user-facing changes

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

• SQL commands, functions, and operators

Release note

array_join is alias to array_to_string.

[codecov]

Codecov Report

Merging #8069 (a896eda) into main (96e852c) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #8069      +/-   ##
==========================================
- Coverage   71.33%   71.33%   -0.01%     
==========================================
  Files        1129     1129              
  Lines      181501   181502       +1     
==========================================
- Hits       129477   129471       -6     
- Misses      52024    52031       +7     

Flag	Coverage Δ
rust	71.33% <100.00%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
src/frontend/src/binder/expr/function.rs	89.30% <100.00%> (+0.01%)	⬆️
src/object_store/src/object/mem.rs	86.48% <0.00%> (-0.78%)	⬇️
...torage/src/hummock/local_version/pinned_version.rs	88.75% <0.00%> (-0.63%)	⬇️
src/meta/src/hummock/mock_hummock_meta_client.rs	65.46% <0.00%> (-0.52%)	⬇️
src/storage/src/hummock/sstable_store.rs	64.62% <0.00%> (-0.32%)	⬇️
src/storage/src/hummock/compactor/iterator.rs	97.95% <0.00%> (-0.30%)	⬇️
src/object_store/src/object/mod.rs	48.65% <0.00%> (-0.21%)	⬇️
src/storage/src/hummock/compactor/mod.rs	80.69% <0.00%> (-0.20%)	⬇️
src/common/src/cache.rs	97.15% <0.00%> (-0.11%)	⬇️
src/common/src/types/ordered_float.rs	31.06% <0.00%> (+0.19%)	⬆️
... and 1 more

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