plugins/vectorcode: add module

Closes #3326

tests/test-sources/plugins/by-name/vectorcode/default.nix

@@ -0,0 +1,60 @@
+{ lib }:
+{
+  empty =
+    { config, ... }:
+    {
+      plugins.vectorcode.enable = true;
+
+      assertions = [
+        {
+          assertion = !(lib.hasInfix "require('vectorcode').setup(" config.content);
+          message = "Empty vectorcode config should not emit a setup call.";
+        }
+      ];
+    };
+
+  defaults = {
+    plugins.vectorcode = {
+      enable = true;
+      settings = {
+        cli_cmds.vectorcode = "vectorcode";
+        async_opts = {
+          debounce = 10;
+          events = [
+            "BufWritePost"
+            "InsertEnter"
+            "BufReadPost"
+          ];
+          exclude_this = true;
+          n_query = 1;
+          notify = false;
+          query_cb = lib.nixvim.mkRaw ''require("vectorcode.utils").make_surrounding_lines_cb(-1)'';
+          run_on_register = false;
+          single_job = false;
+          timeout_ms = 5000;
+        };
+        async_backend = "default";
+        exclude_this = true;
+        n_query = 1;
+        notify = true;
+        timeout_ms = 5000;
+        on_setup = {
+          update = false;
+          lsp = false;
+        };
+        sync_log_env_var = false;
+      };
+    };
+  };
+
+  example = {
+    plugins.vectorcode = {
+      enable = true;
+      settings = {
+        async_backend = "lsp";
+        n_query = 5;
+        sync_log_env_var = true;
+      };
+    };
+  };
+}