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

pyproject.toml

@@ -95,6 +95,7 @@ include = [
     "CONTRIBUTING.md",
     "SECURITY.md",
     "package",
+    "subpackages.py",
     "web.png",
 ]
 exclude = [