[MERGE][IMP] website, website_crm, website_livechat : add website visitors tracking and chat request from operators

This merge adds the website_visitor model that will be used
to track website visitor activity (page viewed, number of visits and
more general info about the visitor (country, lang, etc..)

This model will, in later commit, be used to send chat requests
and push notification from the operators (or backend users)
directly to the visitor.

To keep a detailed history of the visitor page views,
we add a website.visitor.page model that makes the link
between visitor and website.page but that keeps the visit date.
So that we can see if a visitor went mulitple times
on the same page and when. It's useful to see his last page views.

If a website_visitor submit a contact form (and becomes a lead),
the website_visitor is linked to the crm.lead.

If a website_visitor logs in,
the website_visitor is linked to the user's res.partner.

This also allows a livechat operator to send a chat request to a
connected and available website_visitor.

See sub commits for more detailed informations about functional flows
and technical changes/decisions.

Task : https://www.odoo.com/web?#id=2028059&action=327&model=project.task&view_type=form&menu_id=4720

Linked to enterprise PR odoo/enterprise#4834

closes odoo/odoo#34624

Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

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