feat(git): add diffview shortcuts

lua/custom/plugins/diffview.lua

@@ -0,0 +1,19 @@
+return {
+  'sindrets/diffview.nvim',
+  dependencies = { 'nvim-lua/plenary.nvim' },
+  cmd = {
+    'DiffviewOpen',
+    'DiffviewClose',
+    'DiffviewFileHistory',
+    'DiffviewFocusFiles',
+    'DiffviewToggleFiles',
+    'DiffviewRefresh',
+  },
+  keys = {
+    { '<leader>gd', '<cmd>DiffviewOpen<CR>', desc = '[G]it [D]iff view' },
+    { '<leader>gD', '<cmd>DiffviewClose<CR>', desc = '[G]it [D]iff close' },
+    { '<leader>gf', '<cmd>DiffviewFileHistory %<CR>', desc = '[G]it [F]ile history' },
+    { '<leader>gF', '<cmd>DiffviewFileHistory<CR>', desc = '[G]it [F]ull history' },
+  },
+  opts = {},
+}