RTMDet-tiny enablement for detection task

[sungchul2]

Summary

ticket : CVS-142365

This PR includes:

• RTMDet-tiny enablement on detection task
• Minor refactoring

Benchmark results on develop:

all	large	medium	small
test/f1-score	test/f1-score	test/f1-score	test/f1-score
0.671	0.759	0.746	0.508

How to test

Checklist

• I have added unit tests to cover my changes.​
• I have added integration tests to cover my changes.​
• I have ran e2e tests and there is no issues.
• 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

[eunwoosh]

Thanks for your work :) I left some comments. Please take a look.