[ISSUE #449]🎨Optimize SendMessageProcessor#process_request method

[yulanggongwu]

Which Issue(s) This PR Fixes(Closes)

Fixes #449

Brief Description

How Did You Test This Change?

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 22.26%. Comparing base (519dd39) to head (b5a0363).
Report is 1 commits behind head on main.

Files	Patch %	Lines
...tmq-broker/src/processor/send_message_processor.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #450   +/-   ##
=======================================
  Coverage   22.26%   22.26%           
=======================================
  Files         216      216           
  Lines       14942    14942           
=======================================
  Hits         3327     3327           
  Misses      11615    11615           

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