PURPOSE
Allow the user to schedule SMS communication on events
SPECIFICATION
In event.event form view:
* rename tab 'Email Schedule' to 'Communication'
* add a selection field at the beginning of event_mail_ids with label 'Send'
and values 'Email' and 'SMS Text Message' (required with default value
'Email');
* add support of SMS template and SMS sending in event communication;
When sending SMS on event registrations, keep a log of what has been sent.
Use mobile or phone field of event registration as both may contain valid
values, like partner model.
Add SMS template data
* Name: Event: Registration (see data)
* Name: Event: Reminder (see data)
Improve registration model
* add a mobile field to the attendees form view: https://nimb.ws/p0VvyS
Technically this task uses the newly-introduced API methods allowing to
send and schedule SMS.
LINKS
Task 1922187
Part of PR #34705