Sangyeon Cho

## Descripiton This Pull Request introduces a requirements.txt for unified Python dependencies and updates README.md with instructions to install them. I've tested the new setup and encourage others to do...

Remove duplicated import (pydantic)

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Remove duplicated import in `core/config/test_config_load.py`

## 🚀 Feature Currently, custom S3 configurations are only supported in the S3 client. I would like to request that s5cmd also support custom S3 configurations to provide consistency across...

[Enhancement]: add generic type in metaclass

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### Is there an existing issue for this? - [X] I have searched the existing issues ### What would you like to be added? I would like to suggest an...

enhance: add SingleInstanceMetaClass to inherit from a generic type

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### Related issue close #2175 ### Description This PR can improve code readability on IDE. It gives clear type information. | as-is | to-be | | -- | -- |...