Implement unit test for mmdeploy exporter

[eunwoosh]

Summary

This PR includes unit tests for mmdeploy exporter.

How to test

Checklist

• I have added unit tests to cover my changes.​
• I have added integration tests to cover my changes.​
• I have added e2e tests for validation.
• I have added the description of my changes into CHANGELOG in my target branch (e.g., CHANGELOG in develop).​
• I have updated the documentation in my target branch accordingly (e.g., documentation in develop).
• I have linked related issues.

License

• I submit my code changes under the same Apache License that covers the project.
  Feel free to contact the maintainers if that's a concern.
• I have updated the license header for each file (see an example below).

# Copyright (C) 2024 Intel Corporation
# SPDX-License-Identifier: Apache-2.0

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.69%. Comparing base (65f5bd5) to head (5d444da).
Report is 6 commits behind head on releases/2.0.0.

Additional details and impacted files

@@                Coverage Diff                 @@
##           releases/2.0.0    #3183      +/-   ##
==================================================
+ Coverage           72.98%   75.69%   +2.71%     
==================================================
  Files                 182      183       +1     
  Lines               15093    15238     +145     
==================================================
+ Hits                11016    11535     +519     
+ Misses               4077     3703     -374     

Flag	Coverage Δ
py310	75.69% <100.00%> (+2.71%)	⬆️
py311	75.69% <100.00%> (+2.71%)	⬆️

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