refactor: extract implicit conversion helper functions of vector type

[zhongzc]

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Refer to a related PR or issue link (optional)

What's changed and what's your intention?

Move to impl_conv.rs

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.

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[codecov]

Codecov Report

Attention: Patch coverage is 79.81651% with 22 lines in your changes missing coverage. Please review.

Project coverage is 83.82%. Comparing base (19373d8) to head (e92af70).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5118      +/-   ##
==========================================
- Coverage   84.05%   83.82%   -0.23%     
==========================================
  Files        1167     1168       +1     
  Lines      217335   217343       +8     
==========================================
- Hits       182687   182197     -490     
- Misses      34648    35146     +498     

Copilot reviewed 3 out of 3 changed files in this pull request and generated no suggestions.

Comments skipped due to low confidence (2)

src/common/function/src/scalars/vector/impl_conv.rs:24

• [nitpick] The function name as_veclit_if_const is ambiguous. Consider renaming it to convert_const_to_veclit for better clarity.

pub fn as_veclit_if_const(arg: &Arc<dyn Vector>) -> Result<Option<Cow<'_, [f32]>>> {

src/common/function/src/scalars/vector/impl_conv.rs:37

• [nitpick] The function name as_veclit is ambiguous. Consider renaming it to convert_to_veclit for better clarity.

pub fn as_veclit(arg: ValueRef<'_>) -> Result<Option<Cow<'_, [f32]>>> {

[fengjiachun]

LGTM