feat: add renderer.highlight_hidden, renderer.icons.show.hidden and renderer.icons.hidden_placement for dotfile icons/highlights (#2840)

* feat(hidden_decorator): Allow hidden (dotfiles) to be highlighted, both icon and name (this not related to git highlights).

Better defaults

squashed

docs(hidden)

docs(hidden)

docs(hidden)

* fix(typo): small typo on hl groups

* feat(hidden_dotfile_highlight): make a file that has a dotfile parent be also a dotfile

* docs: update docs on hidden highlight

---------

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

lua/nvim-tree/node.lua

@@ -9,6 +9,7 @@
 ---@field fs_stat uv.fs_stat.result|nil
 ---@field git_status GitStatus|nil
 ---@field hidden boolean
+---@field is_dot boolean
 ---@field name string
 ---@field parent DirNode
 ---@field type string