[CHG] core: deprecate get_module_filetree

It's pretty much unused and fairly complicated.

Also deprecate `listdir` entirely since `get_module_filetree` is the
only extant user of the recursive listdir.

closes odoo/odoo#98034

Related: odoo/enterprise#30403
Signed-off-by: Xavier Morel (xmo) <xmo@odoo.com>

odoo/modules/module.py

@@ -217,6 +217,11 @@ def get_module_path(module, downloaded=False, display_warning=True):
     return False
 
 def get_module_filetree(module, dir='.'):
+    warnings.warn(
+        "Since 16.0: use os.walk or a recursive glob or something",
+        DeprecationWarning,
+        stacklevel=2
+    )
     path = get_module_path(module)
     if not path:
         return False