[IMP] web: sidebar actions: send 'select_all' info

In a list view, select some records (either by selecting them one
by one, or by clicking on the header to select all records), then
click on an action (except for the special case of 'Export') in the
sidebar. Some information about the selection is put into the
context:
 - active_ids: the ids of the selected records (only those of the
   current page)
 - active_domain: the current domain

However, before this commit, there were no way to determine whether
the user checked the header checkbox (i.e. all records), or some of
them individually.

This commit adds the information, with a 'select_all' key in the
context.

Note that this is a quick solution, as we need it right now for an
accounting usecase. A more elaborate solution, which will allow the
user to choose whether he wants to apply the action on the selected
ids or on the whole domain, will be developped soon.

Part of Task 2146469

closes odoo/odoo#44248

Signed-off-by: Lucas Perais (lpe) <lpe@odoo.com>

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