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

package/archlinux/ahriman.install

@@ -2,6 +2,7 @@ post_upgrade() {
     local breakpoints=(
         2.9.0-1
         2.12.0-1
+        2.16.0-1
     )
 
     for v in "${breakpoints[@]}"; do