[IMP] website_sale: speed up public category model
[IMP] website_sale: speed up public category model

Speed up:
- all queries involving `child_of` and `parent_of` by using
	´_parent_store=True` and `parent_path`
- `name_get` by also taking advantage of `parent_path`
- `order by` by indexing the sequence

This reduces the time of the corresponding search lines by 20%.

PR: #34249
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo