feat: Add folding

lua/symbols-outline/config.lua

@@ -16,6 +16,9 @@ M.defaults = {
   show_symbol_details = true,
   preview_bg_highlight = 'Pmenu',
   winblend = 0,
+  autofold_depth = nil,
+  auto_unfold_hover = true,
+  fold_markers = { '', '' },
   keymaps = { -- These keymaps can be a string or a table for multiple keys
     close = { '<Esc>', 'q' },
     goto_location = '<Cr>',
@@ -25,6 +28,11 @@ M.defaults = {
     rename_symbol = 'r',
     code_actions = 'a',
     show_help = '?',
+    fold = 'h',
+    unfold = 'l',
+    fold_all = 'W',
+    unfold_all = 'E',
+    fold_reset = 'R',
   },
   lsp_blacklist = {},
   symbol_blacklist = {},