refactor(streaming): use HashKey in join key type

[yuhao-su]

What's changed and what's your intention?

• use HashKey in join key type
• fix a bug when row contains a null datum.

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)

close #1772

[codecov]

Codecov Report

Merging #2087 (2028475) into main (e5f1f8f) will decrease coverage by 0.02%.
The diff coverage is 46.84%.

@@            Coverage Diff             @@
##             main    #2087      +/-   ##
==========================================
- Coverage   71.06%   71.04%   -0.03%     
==========================================
  Files         635      635              
  Lines       81619    81661      +42     
==========================================
+ Hits        58000    58012      +12     
- Misses      23619    23649      +30     

Flag	Coverage Δ
rust	71.04% <46.84%> (-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	70.67% <0.00%> (ø)
src/stream/src/executor/hash_join.rs	88.84% <34.56%> (-1.40%)	⬇️
src/stream/src/executor/managed_state/join/mod.rs	70.76% <79.16%> (+0.52%)	⬆️
src/common/src/collection/evictable.rs	73.58% <100.00%> (+1.58%)	⬆️
src/common/src/types/ordered_float.rs	23.50% <0.00%> (-0.20%)	⬇️
src/prost/build.rs	100.00% <0.00%> (ø)
src/prost/src/lib.rs	96.29% <0.00%> (ø)
src/source/src/manager.rs	45.98% <0.00%> (ø)
src/batch/src/task/task_.rs	37.70% <0.00%> (ø)
... and 13 more

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[liurenjie1024]

LGTM

[TennyZhuang]

LGTM