Replace pkg_resources with importlib.metadata for version retrieval

[Egorrko]

I ran into a problem when executing the command tg-archive --build:
ModuleNotFoundError: No module named 'pkg_resources'
From python 3.12 module pkg_resources isn't available by default.

Recommended method instead deprecated pkg_resources is importlib.metadata
It was added in python3.8, so there shouldn't be any compatibility issues.

https://docs.python.org/3/whatsnew/3.12.html

gh-95299: Do not pre-install setuptools in virtual environments created with venv. This means that distutils, setuptools, pkg_resources, and easy_install will no longer available by default; to access these run pip install setuptools in the activated virtual environment.