[IMP] core, account, lunch: make <menuitem> recursive

For clarity, some data files are formatted as pseudo-tree
structure. This is somewhat confusing and dangerous when the structure
has no meaning... so add meaning:

* allow nesting menuitems, nested items are set as children to the
  parent they're nested in
* update schema to allow an icon *or* a parent on regular menu items,
  and neither on nested (they have an implicit parent meaning can't
  have an icon)
* remove attributes which don't actually exist from the menuitem
  schema
* also type sequence as an integer while at it

Convert two large-ish menuitem data files to recursive form.

closes odoo/odoo#54564

Related: odoo/enterprise#11887
Signed-off-by: Xavier Morel (xmo) <xmo@odoo.com>

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