feat(systemModules:host): add initial host configuration module

used to define general host configuration, including:

- hardware
- name
- admin
- type
- role

system/modules/host/default.nix

@@ -0,0 +1,8 @@
+{
+  imports = [
+    ./admin
+    ./name
+    ./type
+    ./function
+  ];
+}