Refactor:

- Support for module features
- Remove kubenix.module and rather use explicit modules
- Make tests framework independent of k8s module
- Remove metacontroller submodule, which will go to kubenix-modules
- Improved submodule propagation and passthru
- Added additional test for k8s-submodule

modules/base.nix

@@ -0,0 +1,19 @@
+{ config, lib, ... }:
+
+with lib;
+
+{
+  options._module.features = mkOption {
+    description = "List of features exposed by module";
+    type = types.listOf types.str;
+    default = [];
+  };
+
+  options.kubenix = {
+    project = mkOption {
+      description = "Name of the project";
+      type = types.str;
+      default = "kubenix";
+    };
+  };
+}