feat: use split packages (#135)

* move argument parsers to handlers themselves

* use hatchling instead of flit

* Revert "use hatchling instead of flit"

This reverts commit d18d146d79.

* add package-splitt script

* replace simplify walk method

* split packages

* explicitly install packages

* separate support triggers from main package

* add docs examples

* sort actions

* docs update

* add metapackage

* review fixes

docs/advanced-usage/index.rst

@@ -0,0 +1,51 @@
+Advanced usage
+==============
+
+.. toctree::
+   :maxdepth: 2
+
+   handlers
+   views
+
+Depending on the goal the package can be used in different ways. Nevertheless, in the most cases you will need some basic classes
+
+.. code-block:: python
+
+   from pathlib import Path
+
+   from ahriman.core.configuration import Configuration
+   from ahriman.core.database import SQLite
+   from ahriman.models.repository_id import RepositoryId
+
+   repository_id = RepositoryId("x86_64", "aur")
+   configuration = Configuration.from_path(Path("/etc/ahriman.ini"), repository_id)
+   database = SQLite.load(configuration)
+
+At this point there are ``configuration`` and ``database`` instances which can be used later at any time anywhere, e.g.
+
+.. code-block:: python
+
+   # instance of ``RepositoryPaths`` class
+   paths = configuration.repository_paths
+
+Almost all actions are wrapped by ``ahriman.core.repository.Repository`` class
+
+.. code-block:: python
+
+   from ahriman.core.repository import Repository
+   from ahriman.models.pacman_synchronization import PacmanSynchronization
+
+   repository = Repository(repository_id, configuration, database,
+                           report=True, refresh_pacman_database=PacmanSynchronization.Disabled)
+
+And the ``repository`` instance can be used to perform repository maintenance
+
+.. code-block:: python
+
+   build_result = repository.process_build(known_packages)
+   built_packages = repository.packages_built()
+   update_result = repository.process_update(built_packages)
+
+   repository.triggers.on_result(update_result, repository.packages())
+
+For the more info please refer to the classes documentation.