feat: add gitlab plugin

lua/plugins/gitlab.lua

@@ -0,0 +1,19 @@
+return {
+  'https://gitlab.com/gitlab-org/editor-extensions/gitlab.vim.git',
+  -- Activate when a file is created/opened
+  event = { 'BufReadPre', 'BufNewFile' },
+  -- Activate when a supported filetype is open
+  ft = { 'go', 'javascript', 'python', 'ruby' },
+  cond = function()
+    -- Only activate if token is present in environment variable.
+    -- Remove this line to use the interactive workflow.
+    return vim.env.GITLAB_TOKEN ~= nil and vim.env.GITLAB_TOKEN ~= ''
+  end,
+  opts = {
+    statusline = {
+      -- Hook into the built-in statusline to indicate the status
+      -- of the GitLab Duo Code Suggestions integration
+      enabled = true,
+    },
+  },
+}