[ISSUE #4088]⚡️Add inline annotations to delay level table accessors

[WaterWhisperer]

Which Issue(s) This PR Fixes(Closes)

Fixes #4088

Brief Description

Add inline annotations to delay level table accessors for improved performance in LocalFileMessageStore

How Did You Test This Change?

[Copilot]

Pull Request Overview

This PR adds inline annotations to three delay level table accessor methods in LocalFileMessageStore to improve performance by providing hints to the compiler for function inlining.

• Adds #[inline] annotation to delay_level_table() method
• Adds #[inline] annotation to delay_level_table_ref() method
• Adds #[inline] annotation to max_delay_level() method

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[rocketmq-rust-bot]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 26.56%. Comparing base (c2ae50a) to head (fa15264).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4102   +/-   ##
=======================================
  Coverage   26.56%   26.56%           
=======================================
  Files         575      575           
  Lines       81359    81359           
=======================================
  Hits        21609    21609           
  Misses      59750    59750           

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[mxsm]

LGTM