clanCore: refactor flake-module.nix into smaller files

nixosModules/clanCore/metadata.nix

@@ -0,0 +1,32 @@
+{ lib, pkgs, ... }: {
+  options.clanCore = {
+    clanName = lib.mkOption {
+      type = lib.types.str;
+      description = ''
+        the name of the clan
+      '';
+    };
+    clanDir = lib.mkOption {
+      type = lib.types.either lib.types.path lib.types.str;
+      description = ''
+        the location of the flake repo, used to calculate the location of facts and secrets
+      '';
+    };
+    clanIcon = lib.mkOption {
+      type = lib.types.nullOr lib.types.path;
+      description = ''
+        the location of the clan icon
+      '';
+    };
+    machineName = lib.mkOption {
+      type = lib.types.str;
+      description = ''
+        the name of the machine
+      '';
+    };
+    clanPkgs = lib.mkOption {
+      defaultText = "self.packages.${pkgs.system}";
+      internal = true;
+    };
+  };
+}