Explicitly distribute brukerapi.config

[musicinmybrain]

While brukerapi.config is already present in distributed wheels, the following warning appears while building them:

 /usr/lib/python3.12/site-packages/setuptools/command/build_py.py:201: _Warning: Package 'brukerapi.config' is absent from the `packages` configuration.
  !!
          ********************************************************************************
          ############################
          # Package would be ignored #
          ############################
          Python recognizes 'brukerapi.config' 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 'brukerapi.config' 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 'brukerapi.config' to be distributed and are
          already explicitly excluding 'brukerapi.config' 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.
          ********************************************************************************
  !!
    check.warn(importable)

This PR resolves the ambiguity and removes the warning by explicitly adding brukerapi.config to the packages list.