vars: move owner/group to a sops namespace

we want to allow users to use this feature but do not want to use this
option in our own module because it's not supported by password store.

nixosModules/clanCore/vars/secret/sops/default.nix

@@ -40,7 +40,7 @@ in
       flip map vars (secret: {
         name = "vars/${secret.generator}/${secret.name}";
         value = {
-          inherit (secret) owner group;
+          inherit (secret.sops) owner group;
           sopsFile = secretPath secret;
           format = "binary";
         };

nixosModules/clanCore/vars/secret/sops/funcs.nix

@@ -25,7 +25,7 @@ in
               name = fname;
               generator = gen_name;
               inherit (generator) share;
-              inherit (file) owner group;
+              inherit (file) sops;
             }
           )
         )