[17.0][pos_partner_birthdate] add birthdate as a search field in advanced search for partners

[cvinh]

When we have a few customers, we can search a customer using the birthdate, it's working very well.
If we have a lot of customers and you search with the button "advanced search", the birthdate is not found

We would like to be able to search a customer in advanced search using the birthdate

The solution should be to inherit the js async function getNewPartners() in partner_list screen and add birthdate as a search field