build: refactor to achieve proper automatic package discovery

[danielelotito]

Fixes the CI problem below

/root/.cache/uv/builds-v0/.tmpc8qm1z/lib/python3.10/site-packages/setuptools/command/build_py.py:215: _Warning: Package 'no_priors_characterization.utils' is absent from the `packages` configuration.
!!
        ********************************************************************************
        ############################
        # Package would be ignored #
        ############################
        Python recognizes 'no_priors_characterization.utils' as an importable package[^1],
        but it is absent from setuptools' `packages` configuration.
        This leads to an ambiguous overall configuration. If you want to distribute this
        package, please make sure that 'no_priors_characterization.utils' is explicitly added
        to the `packages` configuration field.
        Alternatively, you can also rely on setuptools' discovery methods
        (for example by using `find_namespace_packages(...)`/`find_namespace:`
        instead of `find_packages(...)`/`find:`).
        You can read more about "package discovery" on setuptools documentation page:
        - https://setuptools.pypa.io/en/latest/userguide/package_discovery.html
        If you don't want 'no_priors_characterization.utils' to be distributed and are
        already explicitly excluding 'no_priors_characterization.utils' via
        `find_namespace_packages(...)/find_namespace` or `find_packages(...)/find`,
        you can try to use `exclude_package_data`, or `include-package-data=False` in
        combination with a more fine grained `package-data` configuration.
        You can read more about "package data files" on setuptools documentation page:
        - https://setuptools.pypa.io/en/latest/userguide/datafiles.html
        [^1]: For Python, any directory (with suitable naming) can be imported,
              even if it does not contain any `.py` files.
              On the other hand, currently there is no concept of package data
              directory, all directories are treated like packages.
        ********************************************************************************
!!

[DRL-NextGen]

Checks Summary

Last run: 2026-03-24T17:05:02.654Z

Mend Unified Agent vulnerability scan found 1 vulnerabilities:

Severity	Identifier	Package	Details	Fix
🔸 Low	CVE-2026-4539	pygments-2.19.2-py3-none-any.whl	A security flaw has been discovered in pygments up to 2.19.2. The impacted element is the function A... A security flaw has been discovered in pygments up to 2.19.2. The impacted element is the function AdlLexer of the file pygments/lexers/archetype.py. The manipulation results in inefficient regular expression complexity. The attack is only possible with local access. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.	Not Available

[AlessandroPomponio]

Superseded by #740