codecompanion: extension support

Author: midischwarz12

docs/release-notes/rl-0.8.md

@@ -492,3 +492,7 @@
 - Fix default [blink.cmp] sources "path" and "buffer" not working when
   `autocomplete.nvim-cmp.enable` was disabled and
   `autocomplete.nvim-cmp.sources` had not been modified.
+
+[midischwarz12](https://github.com/midischwarz12):
+
+- Add extension support for [codecompanion-nvim].

modules/plugins/assistant/codecompanion/codecompanion-nvim.nix

@@ -295,6 +295,12 @@ in {
             that can be used in the action palette.
           '';
         };
+
+        extensions = mkOption {
+          type = nullOr luaInline;
+          default = null;
+          description = "Extensions for codecompanion";
+        };
       };
     };
   };