feat(array): implement TrustedLen for ArrayIterator and ArrayImplIterator

[LittleFall]

What's changed and what's your intention?

PLEASE DO NOT LEAVE THIS EMPTY !!!

Please explain IN DETAIL what the changes are in this PR and why they are needed:

• Summarize your change (mandatory)
  implement TrustedLen, added exact size_hint function for ArrayIterator and ArrayImplIterator.

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 #1819

[CLAassistant]

All committers have signed the CLA.

[TennyZhuang]

CI is running: https://github.com/singularity-data/risingwave/actions/runs/2273472937

[codecov]

Codecov Report

Merging #2309 (32844a6) into main (e71d0d2) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2309      +/-   ##
==========================================
+ Coverage   71.03%   71.04%   +0.01%     
==========================================
  Files         665      665              
  Lines       83705    83735      +30     
==========================================
+ Hits        59462    59492      +30     
  Misses      24243    24243              

Flag	Coverage Δ
rust	71.04% <100.00%> (+0.01%)	⬆️

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Impacted Files	Coverage Δ
src/common/src/lib.rs	100.00% <ø> (ø)
src/common/src/array/iterator.rs	100.00% <100.00%> (ø)

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[TennyZhuang]

CI passed, Thanks!