implement package.action rpc/cli command (#503)

* implement package.action rpc/cli command

* use action id instead of name

* make ActionResult display impl nicer

Co-authored-by: Aiden McClelland <me@drbonez.dev>

appmgr/src/lib.rs

@@ -84,6 +84,7 @@ pub fn server() -> Result<(), RpcError> {
 }
 
 #[command(subcommands(
+    action::action,
     install::install,
     install::uninstall,
     config::config,