feat: update cz_template

[Stoiicc]

Summary

This updates the commitizen_cz_template to follow newer Python packaging conventions:

• migrate metadata to pyproject.toml
• remove setup.py in favor of pyproject-only packaging
• move the generated module to a src/ layout

Note on __init__.py

The previously added __init__.py is removed as part of this change.
With the new src/cz_*.py layout, entry points resolve from the installed module under src/, making __init__.py unnecessary.

Related to commitizen-tools/commitizen#1709

[Lee-W]

I think we need to change the files in https://github.com/commitizen-tools/commitizen_cz_template/tree/master/%7B%7Bcookiecutter.cz_name%7D%7D

also this should be categorized as a feature instead of a doc

[Lee-W]

do we still need setuptools

[Stoiicc]

do i replace it uv_build ?

[Lee-W]

sounds like a good idea

[Stoiicc]

I think we need to change the files in https://github.com/commitizen-tools/commitizen_cz_template/tree/master/%7B%7Bcookiecutter.cz_name%7D%7D

which files we need to change ?

[Lee-W]

I think we need to change the files in master/%7B%7Bcookiecutter.cz_name%7D%7D

which files we need to change ?

pyproject.toml and setup.py and etc. please take a look at how cookie-cutter works and you'll have a better idea. Thanks!