feat: pass entry to is_hidden_file and is_always_hidden callbacks

Problem: the is_hidden_file and is_always_hidden config callbacks
only received (name, bufnr), making it impossible to filter by entry
type, permissions, or other metadata without reimplementing entry
lookup.

Solution: pass the full oil.Entry as a third argument to both
callbacks. Existing configs that only accept (name, bufnr) are
unaffected since Lua silently ignores extra arguments. The internal
should_display function signature changes from (name, bufnr) to
(bufnr, entry) to reflect its new contract.

Cherry-picked from: stevearc/oil.nvim#644

lua/oil/mutator/parser.lua

@@ -176,7 +176,7 @@ M.parse = function(bufnr)
   local original_entries = {}
   for _, child in pairs(children) do
     local name = child[FIELD_NAME]
-    if view.should_display(name, bufnr) then
+    if view.should_display(bufnr, child) then
       original_entries[name] = child[FIELD_ID]
     end
   end