This commit introduces models related to sharing dashboard, and
implements the sharing from dashboard view.
The basic idea is the same as sharing normal spreadsheet. The major
difference is that sharing a dashboard will direct to the dashboard view
instead of read-only spreadsheet view. A button and a side panel which
shows the global filters show up only in the dashboard view.
task 3378150
closesodoo/odoo#127370
Related: odoo/enterprise#43664
Signed-off-by: Lucas Lefèvre (lul) <lul@odoo.com>
Co-authored-by: Lucas Lefèvre <lul@odoo.com>
