feat: add api.fs.copy.basename, default mapping ge (#2698)

* feat: add copy basename

* fix: change keymap for copy basename

* fix: use double quotes

* fix: add missing help

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Co-authored-by: Alexander Courtis <alex@courtis.org>

lua/nvim-tree/actions/fs/copy-paste.lua

@@ -295,6 +295,12 @@ function M.copy_filename(node)
   copy_to_clipboard(node.name)
 end
 
+---@param node Node
+function M.copy_basename(node)
+  local basename = vim.fn.fnamemodify(node.name, ":r")
+  copy_to_clipboard(basename)
+end
+
 ---@param node Node
 function M.copy_path(node)
   local absolute_path = node.absolute_path