feat: add callback func

[luhaoling]

🔍 What type of PR is this?

👀 What this PR does / why we need it:

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed

🅰 Which issue(s) this PR fixes:

Fixes #1421

📝 Special notes for your reviewer:

🎯 Describe how to verify it

📑 Additional documentation e.g., RFC, notion, Google docs, usage docs, etc.:

[sweep-ai]

Apply Sweep Rules to your PR?

• Apply: All new business logic should have corresponding unit tests.
• Apply: Refactor large functions to be more modular.
• Apply: Add docstrings to all functions and file headers.

[codecov]

Codecov Report

Attention: 23 lines in your changes are missing coverage. Please review.

Comparison is base (f935d36) 4.97% compared to head (683e9f0) 4.96%.

Files	Patch %	Lines
internal/msggateway/callback.go	0.00%	15 Missing ⚠️
pkg/common/http/http_client.go	0.00%	8 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main   #1480      +/-   ##
========================================
- Coverage   4.97%   4.96%   -0.02%     
========================================
  Files         49      49              
  Lines       4162    4172      +10     
========================================
  Hits         207     207              
- Misses      3943    3953      +10     
  Partials      12      12              

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