fix(array): unify hash function for datum and array

[BugenZhao]

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What's changed and what's your intention?

Unify the hash implementation into Scalar::hash_scalar. Also fix the implementation of the hash_at function for list and struct array.

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)

• Close Hash implementation on Datum is not consistent with Array::hash_at #3457

[codecov]

Codecov Report

Merging #6209 (df635ea) into main (f49b2d7) will decrease coverage by 0.07%.
The diff coverage is 57.87%.

@@            Coverage Diff             @@
##             main    #6209      +/-   ##
==========================================
- Coverage   74.25%   74.17%   -0.08%     
==========================================
  Files         940      944       +4     
  Lines      151208   152247    +1039     
==========================================
+ Hits       112272   112929     +657     
- Misses      38936    39318     +382     

Flag	Coverage Δ
rust	74.17% <57.87%> (-0.08%)	⬇️

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

Impacted Files	Coverage Δ
...batch/src/executor/join/distributed_lookup_join.rs	0.00% <0.00%> (ø)
src/batch/src/executor/join/mod.rs	73.17% <ø> (ø)
src/batch/src/executor/mod.rs	72.30% <ø> (ø)
src/batch/src/executor/utils.rs	33.33% <0.00%> (-23.81%)	⬇️
src/batch/src/task/channel.rs	57.69% <0.00%> (-7.53%)	⬇️
.../batch/src/task/consistent_hash_shuffle_channel.rs	0.00% <0.00%> (ø)
src/common/src/array/bool_array.rs	92.81% <ø> (-0.27%)	⬇️
src/common/src/array/decimal_array.rs	90.52% <ø> (-0.31%)	⬇️
src/common/src/array/primitive_array.rs	89.07% <ø> (+0.80%)	⬆️
src/common/src/array/utf8_array.rs	89.65% <ø> (-0.28%)	⬇️
... and 80 more

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