[IMP] portal: allow user with token to see attachments

Spec
====

Before this commit if a user has access to a document thanks to an access_token,
he would already be able to see the chatter for the document, but he would not
be able to download the attachments that are shown to him on that same chatter.

The goal of this commit it to let the user download those attachments. This
makes sense especially since messages publicly posted in the chatter might
generate emails to the user, and the attachments will already be attached to
those emails, so this PR is not actually granting access to more information to
the user in a typical flow.

The only difference is when said user was added as a follower after the
attachments have been posted in which case he will be able to read them even
though he didn't get the original emails, but this is consistent with how he
will also be able to read the existing messages even though he didn't get them
by email.

Technical
=========

To solve this issue we could have used the access_token of the main document,
but this would allow any user with the token to access all attachments of the
document, including those he should potentially not be able to see such as those
from internal notes.

Instead we ensure a different access_token is properly set on each of the
attachments that are going to be shown and we update their links accordingly.

This allows for a more granular access control, and it also takes advantage of
the existing /web/content route without having to adapt it.

opw-2040455
Also discussed in task-37264

closes #34384

closes odoo/odoo#35121

Signed-off-by: Olivier Dony (odo) <odo@openerp.com>


Co-authored-by: Pratima Gupta <pgu@odoo.com>
Co-authored-by: Sébastien Theys <seb@odoo.com>

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