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/views.rst

@@ -0,0 +1,41 @@
+Writing own API endpoint
+========================
+
+The web service loads views dynamically, thus it is possible to add custom API endpoint or even web page. The view must be derived from ``ahriman.web.views.base.BaseView`` and should implement desired HTTP methods. The API specification will be also loaded automatically if available, but optional. The implementation must be saved into the ``ahriman.web.views`` package
+
+Let's consider example of API endpoint which always returns 204 with no response:
+
+.. code-block:: python
+
+   from aiohttp.web import Response, HTTPNoContent
+
+   from ahriman.web.views.base import BaseView
+
+   class PingView(BaseView):
+
+       async def get(self) -> Response:
+           # do nothing, just raise 204 response
+           # check public methods of the BaseView class for all available controls
+           raise HTTPNoContent
+
+The ``get()`` method can be decorated by ``aiohttp_apispec`` methods, but we will leave it for a self-study, please, consider to check examples of usages in the main package.
+
+In order to view to be added to the route list correctly, few more properties are required to be set. First of all, it is required to specify ``ROUTES`` (list of strings), which contains list of all available routes, e.g.:
+
+.. code-block:: python
+
+   ...
+
+       ROUTES = ["/api/v1/ping"]
+
+In addition, it is also recommended to specify permission level for using this endpoint. Since this endpoint neither does anything nor returns sensitive information, it can be set to ``UserAccess.Unauthorized``:
+
+.. code-block:: python
+
+   ...
+
+       GET_PERMISSION = UserAccess.Unauthorized
+
+That's all. Just save the file as ``/usr/lib/python3.12/site-packages/ahriman/web/views/ping.py`` (replace ``python3.12`` with actual python version) and restart web server.
+
+For more examples and details, please check builtin handlers and classes documentations.