plugins/copilot-cmp: move to by-name, migrate to mkNeovimPlugin

plugins/by-name/copilot-cmp/default.nix

@@ -0,0 +1,74 @@
+{ lib, config, ... }:
+let
+  inherit (lib) types;
+  inherit (lib.nixvim) defaultNullOpts;
+in
+lib.nixvim.neovim-plugin.mkNeovimPlugin {
+  name = "copilot-cmp";
+  moduleName = "copilot_cmp";
+
+  imports = [
+    { cmpSourcePlugins.copilot = "copilot-cmp"; }
+  ];
+
+  maintainers = [ lib.maintainers.GaetanLepage ];
+
+  # TODO introduced 2024-12-19: remove after 25.05
+  deprecateExtraOptions = true;
+  optionsRenamedToSettings = [
+    "event"
+    "fixPairs"
+  ];
+
+  settingsOptions = {
+    event =
+      defaultNullOpts.mkListOf types.str
+        [
+          "InsertEnter"
+          "LspAttach"
+        ]
+        ''
+          Configures when the source is registered.
+
+          Unless you have a unique problem for your particular configuration you probably don't want to
+          touch this.
+        '';
+
+    fix_pairs = defaultNullOpts.mkBool true ''
+      Suppose you have the following code: `print('h')`.
+      Copilot might try to account for the `'` and `)` and complete it with this: `print('hello`.
+
+      This is not good behavior for consistency reasons and will just end up deleting the two ending
+      characters.
+      This option fixes that.
+      Don't turn this off unless you are having problems with pairs and believe this might be
+      causing them.
+    '';
+  };
+
+  settingsExample = {
+    event = [
+      "InsertEnter"
+      "LspAttach"
+    ];
+    fix_pairs = false;
+  };
+
+  extraConfig = {
+    warnings =
+      let
+        copilot-lua-cfg = config.plugins.copilot-lua;
+        isEnabled = b: (lib.isBool b && b);
+      in
+      lib.optional (isEnabled copilot-lua-cfg.suggestion.enabled) ''
+        It is recommended to disable copilot's `suggestion` module, as it can interfere with
+        completions properly appearing in copilot-cmp.
+      ''
+      ++ lib.optional (isEnabled copilot-lua-cfg.panel.enabled) ''
+        It is recommended to disable copilot's `panel` module, as it can interfere with completions
+        properly appearing in copilot-cmp.
+      '';
+
+    plugins.copilot-lua.enable = lib.mkDefault true;
+  };
+}