Currently when inviting someone on a document all recipients are considered
as standard customers. It means access buttons are not displayed and
addon specific behavior not really triggered.
This commit makes use of ``_get_recipient_data`` tool method allowing
to categorize recipients in groups and display buttons and action links
like other post on documents.
Task ID 1967234
closesodoo/odoo#38111
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>