[ADD] mass_mailing_sms: support SMS in mass mailing

PURPOSE

SMS are a powerful marketing tool. For instance it is perfect to announce a
sale or to communicate a coupon code, to welcome a new customer in a fidelity
program, ...

Purpose of this task is to integrate SMS sending in batch in mass mailing. It
will use same mailing objects but sending SMS instead of emails. Some metrics
and flows will have to be slightly updated at the same time.

SPECIFICATIONS

Create a new application called "Mass SMS" that follows the structure of
mass_mailing application.

General guidelines

  * use the fa-comment icon for this module;
  * add a "Notification type" field to the mailings: email or sms. Set it
    invisible and set as domain from context when choosing mass mailing or
    mass sms application (menus / action specific);
  * adapt the metrics from Mass Mailing to SMS
    * sent = received = whether the SMS was sent or not;
    * opened => we don't have this information;
    * replied => we don't have this information;
    * clicks = from link tracker (no change of behavior);
    * bounced = SMS that failed to be delivered because the format is wrong;
    * exception = any issue when sending SMS;
  * keep the Mailing Lists menu, hide email related fields on contact model;
  * settings: hide the "Specific Mail Server" feature

Mailing form view

  * add an "SMS Content" tab between Mail Body and Options. In there, we should
    have the following fields:

    * content
    * opt-out link: provide a link to the Unsubscribe page. Make it as short
      as possible;
    * SMS Template

  * add an "SMS Text Message" Medium;

Mailing actions

  * add an "SMS Sent" smart button. Use the fa-comment-o icon and it should
    redirect to the same list views as the "Email sent" smart button and list
    the contacts to which an SMS was sent;
  * add a "Mobile" field in the list views of the "Email sent" smart button:
  * adapt the TEST button > Test Mailing modal to SMS (we should have 1 button
    for Email and 1 for SMS); update description;
    * default value for the Recipients field should be Name of the current
      user, work mobile/phone number;
    * If there are no Work Mobile/Phone numbers set on res.users, display
      (123)-456-7890 instead;
    * rename the Send Sample Mail button into Send Sample SMS;

  * adapt the SEND NOW button > Confirmation modal to SMS. Change the message
    into "This will send the SMS Text Message to all recipients. Do you still
    want to proceed?"
  * hide the following elements:  Subject, From, Reply to, Attachments, Mail
    Server, Mail Body tab; Opened, Replied;
  * adapt the label of the following "warnings" to SMS
    * x SMS Text Message(s) have been ignored and will not be sent.
    * x SMS Text Message(s) are in queue and will be sent soon.
    * x SMS Text Message(s) could not be sent.

Mailing kanban view

  * hide the following stats: https://nimb.ws/grvBn0: Opened, Replied;

Mailing list / contact management

  * following fields should be left empty: https://nimb.ws/3HBeJL: Opened,
    Replied;
  * when browsing through mailing lsits and contacts through the Mass SMS
    application, update actions and views to hide fields related to
    email and display only phone-related information;

UTM Campaign

  * form view > Related Mailings tab: the following fields should be left
    empty if notification type = SMS: https://nimb.ws/nfvr1O: Opened, Replied

Mass Mailing > Reporting (mail.trace.report model)

  * adapt the reporting based on the fact that we do not have the following
    metrics for SMS: Opened, Replied;

Mass Mailing > Configuration > Blacklist

  * do not display any email information (phone blacklist is about phone);
  * support phone blacklist. Phone blacklist is therefore a separate model
    from mail.blacklist to simplify management. It is included in sms sending
    process like mail blacklist when mailing in mass;

Opt-out and blacklist handling

  * we do support mailing lists because they could come from different sources
    and are a way to communicate with a specific audience (and not just a list
    we bought), e.g. subscribe to this list to be kept updated whenever this
    product is back in stock, or to receive results of this ...
  * if the SMSing is from a list, opt-out removes ourselves from the list;
  * if it is from the contact ==> Sent to blacklist;
  * allow to attach unsubscription links in sent SMS, redirecting to a new
    route in mass mailing SMS allowing quick unsubscribe and/or blacklist
    of phone numbers;

Error management

  * if the user clicks on Send Now / Schedule / Test and does not have enough
    credits, open the "Insufficient credits" modal in a lazy option (aka when
    having failed statistics linked to insufficient credits);
  * on the mailing, we however display this failure as :
    * a message on the mailing kanban view
    * a message on the top of the form view + same behavior as the mailing and
      "Could not be sent" https://www.screencast.com/t/BExgd1Gc;

LINKS

Task 1997464
PR #34424
Original SMS addition: Task 1922163 (4287481b)